Which is why I think Demandred has spent months building dozens of hidden armies using the Ways and Portal Stones. We've seen hints in Ebu Dar and Tear. I imagine there are other bands of Trollocs throughout the Westlands lying in wait for Demandreds command.

He may ALSO be Roedran, or on an outside chance Galgan (I can't remember if that has been debunked) ... Who seems to still be trying to assassinate Fortuona which would give the Shadow a potent force to destroy Rand.