How can Venat be the previous Azem?

[Ryaz]

Speaking of Azem going MIA without siding with anyone, I feel this plot is going to be important if not THE source of Season 2 events and Season 2 Antagonists.

The whole Azem going MIA and being a big mystery during events of Hydaelyn/Zodiark struggle even before the Final Days is rather strange and suspicious.

I'm guessing Azem knew of the Final Days before it happened as well. Venat probably told them. It would explain how he/she knew that we'd be coming to help Elidibus with Pandaemonium.