Thank you, this is very helpful. (edit: Erm, out of curiosity, when was Addy picked up by the Volturi? Please and thanks.)

So Elspeth certainly has several sets of memories from werewolves, on top of the half-vamp memories she has from Allirea and herself, at least. It's possible for the theory to be tested in-universe, then, dependent on getting Alice back on their side.

(no pun intended)

That's a shame, because it's fairly hilarious.