Oh yeah...the actions of some of the Black Tower people clearly line up with what we know happens when the 13x13 trick is used.

As for Demandred...*shrug* His role has always been as the final general of the Shadow, leading huge armies against Rand. Personally I think he is in Shara, as this is the only place left for him to get said huge armies with channelers that could threaten Rand, but maybe he will just be leading shadowspawn. I don't know. Regardless, as Rand says, the time for subterfuge and hiding in the shadows has passed, now War will decide the day. So it makes sense when you think about it that Demandred would be saved for aMoL.

I definately don't think that he is that asha'man though. You really think someone who's reason for joining the Shadow was to prove that he is better than LTT both as a general and as a channeler would be some random guy joining the Black Tower as a nobody at this late date?