It doesn't "make sense," but it makes sense. If your autism isn't absolutely crippling, things flow together well enough, and the contradictions are obvious enough, that it's very easy to understand what was "supposed to" happen. Yes, the recap in Evil Dead 2 is technically different, and technically means Evil Dead 1 isn't canon to it, but come on, you know better than that. You know Evil Dead 1 is intended to be canon. Technically the ending of Evil Dead 2 is different from the beginning of Army of Darkness, it's very easy to understand and accept that Evil Dead 2 is canon, just the ending is slightly different. This is different from cases where there are plot holes and contradictions that seem to happen just because they don't give a shit. Here it's so obvious that we understand the intention, and it's clear that they knew what they were doing, but it's like come on, man.
That said, I love multiverse autism. I do have to read more of the comics. But the way I see it, the only really interesting stuff to do with it would be to see the alternate events that would have followed the actual ending of Evil Dead 2, and I suppose the other ending of Army of Darkness, which I'm sure probably has a lot of comics.