Wait, hold on a sec...how do we know that he hasn't already unlocked that power? I mean, you saw how powerful he's gotten lately. And another thing, you said that the Elemental Spirits were symbiotic with the other races, and that didn't include humans. So why would the Water Spirit possess Az, a human? And let's say that is the case, how would we even go about confirming it?
"That's, uh, a lot of questions. Let me tackle them one by one...first, I'm fairly certain that if he is possessed by the Water Spirit, he hasn't released the locked power yet...he said that all he's doing differently is putting physical effort behind his attacks, that's not enough to unlock that power, trust me on that."
Okay, go on...
