particularly since Demandred isn't going to be the main villain of AMOL.

Second point, relating to your earlier post in this thread, is that it seems quite unlikely Demandred was Taim's teacher. Demandred has been out for less than two years, and Taim was already proclaiming himself the Dragon in EOTW (if, as is likely, that's what the rumors mean; he's known by the beginning of TGH at the latest). There wasn't a great deal of time between his disappearance and reappearance, possibly enough for a One Power crash course but not extensive training plus a Forsaken lieutenancy certification. If he's had a master, it was Ishamael.

Also, there is no Waygate in Tear; it's out on the Plains of Maredo. Small distinction given that Tear seems to have no walls and the Stone is obviously vulnerable to channeling-based attacks, but there'd be a difference in tactics.