Well if you need Sorilea to be a DF then it's plausible. And if Sorilea is Santa Claus then it's plausible that she has a stash of presents somewhere to give to the Aiel kids at the Feast of Lights. But since there has NEVER been even a hint of Sorilea being a DF, and since the Aiel in general have a very small percentage of DF's it's unlikely in the extreme. Don't forget that every other major character that is DF has had a blatant hint slipped in here or there, Verin with her "Moiraine sent me" statement in tGH, Sherimam being whipped for not divulging Egwene's plans etc. Personally I think the simplest explanations are the best. We have SH, the avatar of the DO in the Wotverse, running around with special, and in many cases unkown powers. We have Elza Penfell, a sworn BA. Why do you need to jump thru hoops to try to prove that another character did the deed? Especially since Sorilea has NEVER demonstrated even the least inkling that she's a DF. Speaking of plausibility, if Cadsuane is a DF, then nobody had to betray her. I think the likelyhood of Caddy being a DF is as great as the likelyhood of Sorilea being one.

NaCl(I don't see why everyone tries to complicate this, KISS )H2O