Originally Posted by
Phantom Roxas
Didn't Bendis' X-Men annuals make the sliding timescales full-on canon? I mean, it might just be limited to 616, so may it doesn't have any effect on MC2, but eh.
That said, Vortex, your map pretty much sums it up. Regardless of the wibbly wobbly timey wimey shenanigans with MC2, OMD and the fate of baby May are the points of divergence.
Now, if we're talking about it from a writing perspective, MC2 isn't actually a "guaranteed" future for Peter, because given the refusal to actually allow Peter to grow up, that postpones Mayday actually being allowed to be a character with a sense of presence in the narrative, and as such, writers can make additions or changes that also prevent 616 from turning out like MC2. Characters who die in 616 yet are still alive in MC2 can only rely on this being comics to avoid changing the timeline too much. At this point, 616 is on the way of merely resembling MC2. While Mayday's birth is certainly the catalyst for MC2, it's not the sole defining factor.
What's weird about Mayday going back in time is how it doesn't make sense both ways. While it makes perfect sense for Mayday to go back to an early point in her universe's timeline, that would only work if it her home time period can remain a potential future of 616. Of course, I might be overthinking things (WHO'S SURPRISED?!), and the simplest explanation could just be that OMD was written after that issue of Spider-Girl, and because OMD was such a half-assed job that chose to disregard its effect on the timeline, instead opting to make Mephisto take two or three alternate forms to keep the timeline intact. OMD/OMIT prioritized the idea that you could get rid of the marriage with no consequences, limiting MC2's influence on any consideration given towards what OMD/OMIT set out to do.
I would like to believe that RYV Peter is the "original" Peter as you'd put it, although that itself raises questions that no one would consider unless you're some kind of idiot. So, you know, me. For example, if that's what we would prefer to consider 616 Peter, what does that say of the current Peter and MJ? Should they be alternate universe counterparts? Has the supporting cast slowly expanded to replace each character with counterparts from an alternate universe? Is this entire universe even still 616? Are there other universe-altering events beyond OMD, perhaps even beyond Spider-Man, that had just as powerful effects?
…I think I lost the point somewhere along the way. Perchance several years ago. Remind me not to write time travel stories.