Yea, I was wondering if my edit would get lost, so I posted another to bump the thread. 
I think it’s more… provocative… if Azrai actually changed… has a sort of poetic tragedy to it. I think he was good in the beginning, but became evil like evil usually happens.
But, as a god of knowledge, he presumably thought he was the smartest. And, I’m willing to bet he was better at (say) divination then even Vorynn was. Or, maybe not “better”, but just skilled in a different way, if that makes sense. Whatever the case, he developed the whole evil mastermind persona over eons of figuring out how things worked (again, God of Knowledge), while the other gods were content to remain focused on their strengths.
But, eventually, the gods wanted to change. Probably Basaia was the most perturbed about how things just didn’t always go according to the way she wanted things to go. Anduiras, for different reasons, too. Basaia, being the Goddess of Magic, began to explore ways to change that.
Azrai went, whoa, that’s not good. Couldn’t persuade them to change their minds, and definitely knew clamping down on the ever-changing was A Very Bad Thing. So, began plotting.
And then humans crawled out of the forest with their opposable thumbs, and the other gods went, “ooo, shiny new playthings!”, and Azrai said, “uh, they’re a step above apes, really dudes?”, and then Azrai saw that they gave his bros and sistas extra power, and was like, “Hey! That’s not fair! Where’s my fam?”, and the rest, as they say, is history. 
Or, something like that.
Anyone want to posit other theories?