But is he still? I guess untill nothing outright contradicts his story (like Khadgar having Atiesh instead of him) he can stay canon but it seems even Blizzard wants to forget about him.
By the way old Varok might also be a good candidate. I'd guess Sargeras is still bitter about that whole Broxigar thing, and Saurfang Sr. is the closest living relative.
I might just make a poll for this.