The fact that the kids story parallels the events of what we know seems like a good lie to me. There were even subtle hints like how the kid knew how Ruth liked her eggs cooked, and then in the alternate world the recording has the father talking about asking his alternate Deaver how he liked his eggs cooked. In 11/22/1963 it was Time that was obdurate. I don't disagree that the bad things happen because they're both out of place, just that they're not time travelling. They're slipping between worlds. For all we know they're experiencing the same time span. Plus only one of them is aging. But the season was different when young Deaver crossed over, so you may be right.
But when Alan called business-man Deaver he sounded roughly the same age as the Alan we're familiar with, so they can't be too far apart. I guess even a second out of time is still out of time, though.
I think the kid is dead. I think he died sometime after crossing over and this is an imposter with his face. His skin color is warm and alive in his world, but he's pale like a zombie in this one. Of course 27 years in the dark might do that to someone, too.
I never finished 11/22/1963, though. The past was obdurate obdurate obdurate blargh. The story seemed to meander around school dances. By the time I got to the meat of the book I couldn't make myself finish it. Stephen King is still my favorite author, though lol.