Kindred. The main villain of Nick Spencer's run. The demonic monster who haunted Peter Parker for months because of a mysterious "sin" he committed in the past. In Amazing Spider-Man 50 we discovered that, under his mask, Harry Osborn was trying to ruin Peter's life again. Case closed? Not exactly, because Amazing Spider-Man 73 revealed that Kindred was not one, but two: Sarah and Gabriel Stacy, every Spider-Man fan's most hated memory. Harry (who was actually a AI created before his death) was using their bodies as vessels to haunt Peter and Norman, who sold Harry's soul to Mephisto years before turning himself into the Green Goblin. But here we stumble into a giant problem.

What does Kindred want from Peter and Mary Jane?

Harry and the twins hate Norman for various reasons: he's a psycho that ruined their lives, lied to all of them and sold Harry's soul. So that's clear and simple. But why does Kindred target Peter and MJ? Why does Kindred obsessively talk about a "sin" Peter and MJ committed? So, I went back and read some parts of Spencer's run again, and it still makes no sense to me. Let me know if you can guess what happened here, because I strongly believe Marvel messed with Spencer's plans in the last 10 issues or so, otherwise this really makes no sense.

Amazing Spider-Man 50: Kindred digs up Peter's loved ones' bodies (George and Gwen Stacy, Flash Thompson, Ben Parker) and Norman reveals that Kindred is his son, Harry Osborn.
Amazing Spider-Man 52: Kindred confronts Peter, blaming him for his loved ones' deaths. He also says "all your ghosts live through me" while we see Gwen's skull. Then, he snaps Peter's neck.
Amazing Spider-Man 53: Kindred stands guard as Liz and Normie sleep. Then, we literally see a flashback scene from Brand New Day and Peter looks scared, saying "I remember what day this is". This is the first huge One More Day reference, that ultimately led to nothing. Peter wakes up (how exactly? His neck was snapped, but ok) and witnesses Kindred taking off his mask, revealing Harry's face. He also says "you always knew it was me", so the issue clearly wants us to believe Kindred is Harry and he's doing this because of One More Day and Peter and MJ's deal with Mephisto.
Amazing Spider-Man 54: Unmasked Kindred states "Oh, it's me, Pete. Your old pal, Harry Osborn". After a fight, Peter says "You really had me thinking you were some all-powerful monster, not the same sad, broken child I've had to fight for years!": this is a reference to Kindred being able to appear in nightmares and other mysterious phenomena. Be aware, no explanation will be given for this in the whole run. Kindred also says "I promise you, I'm past all that (issues with Norman). I'm no longer chased by those demons, I am the demon!": this would make you think Kindred's goal is not to hurt Norman, as he also confirms that he is a demonic entity. Then, Kindred kills Peter various times and claims "In hell we're not punished for the sins of others, we're tortured by our own". This is one of the first times Kindred accuses Peter of committing something terrible, but of course he doesn't say what happened. Kindred also states "You tried to bargain and make a deal with the devil": if this is not a clear OMD reference, I don't know what is.
Amazing Spider-Man 55: Kindred's face gets literally destroyed by Peter's web, but nothing happens. Remember that ASM 53 showed us that Kindred's face was just a mask, so how is this possible? Is Kindred a demon or not? Then, we take a trip down memory lane and Kindred remembers that MJ always loved Peter and not him blablabla... This is another clear example of Kindred obviously being Harry and nobody else. At last, the most important part: Peter says "Whatever I did, however I wronged you... I'm sorry. Whatever caused you to turn yourself into this..." and Kindred "Turn myself? You did this to me!", followed by another flashback of Brand New Day. So it is explicitly said: Peter did something (probably related to Brand New Day) which caused Harry to turn into Kindred.
Amazing Spider-Man 56: Kindred gets caged into a dark matter trap. Sounds silly and it is, if he really is a demon.
Amazing Spider-man 57: Spider-Gwen says "Any other decisions you made for our supposed benefit, Peter? Because I'm getting the sense there is a lot you're not telling us". OMD reference #4.
This is where the story visibly starts to shift, and I think that's where Marvel changed Spencer's plans to address One More Day.
Amazing Spider-Man 70: First reference to the Stacy twins: Harry goes back to Norman's Paris house, a holding "with a tortured history of its own". Remember Gwen supposedly gave birth to the twins in Paris.
Amazing Spider-Man 71: Flashback of demonic Harry finding Mysterio in hell. Another confirmation of Kindred's demonic nature. Kindred's monologue about Harry's death in the ambulance confirms once again he is Harry Osborn.
Amazing Spider-Man 72: Norman's deal with Mephisto is revealed. Norman arrives to his house in Paris and he's confronted by AI Harry, who reveals the original Harry uploaded both their minds there (during Legacy of Evil, meh).
Amazing Spider-Man 73: The big plot twist: Kindred is actually Sarah and Gabriel Stacy, two clones created by AI Harry and Mendel Stromm back when Norman was still believed to be dead. AI Harry apparently can control their bodies as vessels and he asked Mysterio to brainwash Norman (once he came back) and MJ to think Gwen gave birth to them, just to mess with Peter and Norman (yeah, not a great explanation honestly). Also, the post-OMD Harry Osborn is another clone and he never came back from the dead. The main focus here is that AI Harry literally speaks through Sarah, so it looks like he can control her (and Gabriel) any time he wants. Also, someone (identity never revealed) cyclically buried Sarah and Gabriel, every time they died because of clone degeneration. But the most important thing of the issue is that Sarah/Harry recalls that Peter saved the twins' lives with his blood transfusion during Sins Past (keep this in mind). Also, Kindred looked like Harry because they used Chameleon's serum (weird for a powerful demon, couldn't he shapeshift?).
Amazing Spider-Man 74: The end. The Kindreds attack Peter and Norman, and suddenly one of them has a female body (not only that, the female one is the brown Kindred, but in the last issue Sarah was the purple one!). Post-OMD Harry attacks the Kindreds (he managed to travel from a cell to his home to wherever the fight is... with no explanation) and explains the truth to Peter: Kindred is a vessel... except that it's not. In this issue the twins clearly speak for themselves, nobody is controlling them like in ASM 73. The Kindreds also say "You'd love that! To ignore us, pretend we don't exist" as the main issue of the whole situation. But they also claim that Norman abandoned them, his children, and used them as weapons... so they don't know they are clones controlled by AI Harry and Mephisto? They even attack Norman after he reveals the truth to them, so how did AI Harry control them in the last issue without them knowing? Mephisto then reveals that Sarah and Gabriel suffered in hell and were sent back to Earth to gain revenge on the one "who failed to save them and wanted only to forget them". Who, Peter? The same guy who saved their lives in Sins Past? Makes no sense at all. After Mephisto's defeated by Strange, the Kindreds die... saying that Mephisto lost! So, they actually knew the truth...? My head hurts.

And this is it. Yeah, I know Mephisto wants to destroy Peter because he saw a future in which his daughter defeats him, but I don't think it's a great explanation for ALL of this. Did you get Kindred's real goal? What was Peter's sin (if not OMD as clearly hinted in the first issues)? Why did the twins hate him? Why did AI Harry hate him? What was the whole point?
If someone can come up with something useful I will be very happy, as a Spider-Man fan! Thanks.