You know, there was a while there when lots of people were specualting that Jacob = Aaron, and I have no idea whether that is the case. But I haven't really heard anyone speculate that MIB = Aaron. In Recon, MIB explains to Kate how he also had a mother who was crazy, and that MIB is still trying to work through the issues that this created for him. Is it possible that the crazy mother that MIB is referring to is actually Claire?
Ofcourse this creates lots of complications such as the fact that MIB appears to be centuries old whereas Aaron is still just a kid, but this would be where the whole time travel aspect would come into play.
Any thoughts on this?