That Demandred will let Roedran attack Andor at basically the same time, when the Trollocs will attack the Borderlands, possibly supported by Taim's cronies & other DF. Bryne told in the books that Murandy could muster a significant army, and it fits with Demandred's statement that he is gathering for war and will be ready (Taim's cronies were already gathered!). This move will help to create more chaos and strife among humankind and prevents united Westlands (which Rand has to achieve).

Fain is probably just hunted by the Super Darkhound Pack (and likely Slayer) and will be killed soon (this scene will probably told by Slayer, who will then reveal that he killed the traitor Asmo as well). Fain's wildcard role is played, IMO. To give Fain yet another power base that late in the story doesn't make much sense.