I think GlamMike is quite possible.

Mostly because I looked at it on the FNaF theory wiki and found it has only three problems, at least as listed on the wiki. Also, it's just extremely narratively satisfying for Mike to watch over a kid who looks like the brother he killed.

I feel a lot of people don't think about this theory because they pair it with GregBot, and all the other theories MatPat made when he was probably smoking.