Okay, so Aksis, Archon Prime is the final boss of WoTM, but anybody remember Aksor, Archon Priest? Good ol' strike boss on Venus. (who also became Taken in the April update)
Now, I know that this is all probably coincidental, since Fallen hierarchy retain similar appearances across the different houses. But if you look at Riksis (the only other Archon we're exposed to), he has a different head shape than Aksor and Aksis. Aksor and Aksis also have the same head shape, which means that they are both Archon Priests. Its a stretch to say that they are one in the same, but it could be possible. Say its another Skolas situation, except Aksor was killed, splicers revived him, and he became a Devil Archon Priest hungry for power.
Also
[b][u]AK[/u][/b]sor — [b][u]AK[/u][/b]sis
[b][u]PR[/u][/b]iest — [b][u]PR[/u][/b]ime
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Well, you'd first have to revive the dead, which I have yet to see SIVA do, so I'm gonna go with a no on this one.