I hope you guys like walls of text, because this surely is a wall of text. But a sourced wall of text, so it's not like all of it just came out of nowhere and such.
This is a subject that is likely not going away anytime soon. With both sides remarkably silent on the matter, I just figured to compile as much info as possible and lay down the case as to what I think happened and how it probably was intended to play out. Yes, this isn't 100% factual or anything and I'm not going to claim it is, but I'll present all the data and you guys decide whether you agree with it, or think I'm full of crap.
If I am to start out this article keeping your attention, yes, I believe Marvel meant to at the very least adress One More Day with Spencer's run, and I'm going to expand on why I believe that was the case.
Maybe we should start right off the bat with the question on everybody's mouthes.
Did Spencer's run go through changes?
In a list of questions that are increasingly going to get less and less clear-cut answers, yes, Spencer's run did. It is not the "gotcha" you think it might be.
Ben Reilly was supposed to be in "Last Remains". Peter was also supposed to meet up with Matt Murdock in jail shortly after that arc concluded. All that remains of these intended plot threads are breakdowns by Mark Bagley. Spider-Man editor Nick Lowe referenced this, saying Ben "ALMOST" was in Last Remains in an editorial.
Why were these cut out?
There are a couple of likely explanations. "Last Remains" picked up after "Sins Rising", and "Sins Rising" was delayed due to the Covid pandemic breakout. During this time, Marvel even ordered a "pencils down" period as they - and the world at large - learned how to deal with the pandemic. Whether Marvel lost faith in extending "Last Remains" with a possible "Order of the Web" spin-off due to market uncertainty, or some other factor entirely, is mostly our guess.
"Some other factor entirely" might just be Substack
Spencer's interviews about the book seemed to always have the notion of a long run - in light of Slott's near decade long run, maybe something comparable, even if not the same length. He'd talk about how "the first year" of the series would change gears halfway through and whatnot. It seemed a little curious when he said "Sinister War" was the "home stretch of his run" in April 2021.
One way or another, it does seem like everyone at the time was surprised Spencer was leaving the title "early", to put it that way, according to insiders. Then, we found out Spencer was leaving Marvel altogether for Substack, not just leaving Amazing Spider-Man. This suggests Spencer's story was cut in scope overall, and the plot threads dealing with One More Day were reshuffled towards Sins Past at the very last minute.
This video has a comprehensive breakdown on what Substack is. As it so happens, Spencer reached out to Substack on what was likely the "pencils down" period of the pandemic, where anyone involved in the comic industry likely suffered heavy financial losses.
Spencer ended up becoming "liaison" between creatives like Johnathan Hickman and James Tynion IV to Substack itself.
If you're wondering "why hop over to Substack", in the words of Tynion himself:
The timing matches when Spencer's pacing became a bit more erratic, to put it that way, instead of allowing disparate subplots and Kindred to breathe more organically. Per Lowe's admission in a different editorial, Beyond was already being planned as far as late 2020, nearly a full year before Spencer's run actually concluded.