Did we reverse Emet's tempering at the end?

[Alleluia]

Unlikely. Curing tempering requires careful focus and an abundance of aether. We were on the verge of turning into a Lightwarden while the Scions are getting smacked around behind us, then we threw an axe through his chest.

What we did pretty clearly didn't even remotely resemble the actual cure for tempering that was later discovered, too, so I'm gonna say no, we definitely didn't.

I think injecting him with a huge amount of light aether, thus countering his imbalance towards darkness, is exactly the same mechanic our cure for tempering uses.

The concentration and carefulness that we display with the normal cure process later on is cus we're doing it on purpose now, and we actually want the people we're curing to live afterwards. But neither of those things has to be true for the actual aetheric rebalancing that breaks tempering to occur. That's just something akin to a chemical reaction. If you have the necessary components of it present, it'll happen.

His bath in the Lifestream probably did it, but there's nothing suggesting Emet was cured of his tempering prior.

Him accepting his loss and smiling at us when we agree to remember them seems like it indicates he's no longer being compelled to aide Zodiark's return. He's accepted the plan has fallen through and its not happening. I think that's suggestive that he's no longer tempered.