Heavy spoilers ahead.
The real Zenos not only got his body back, but he freaking killed the emperor.
Uh...that's like super duper important. He has no interest in continuing his father's schemes. He cares little about the "beasts" of Eorzea, or the struggle between Hydaelyn and Zodiark. He cares nothing at all about Ascians or Calamities. He only wants the Hunt. He only wants his one true friend and enemy: the Warrior of Light. That is literally all he cares about.
This means that Black Rose and anything else the Garleans were planning probably won't happen now. We'll have to see what happens to Gaius and Estinien, but now the empire is totally unpredictable.
On top of that, when we get back to the Source and get an update from Tataru, she tells us that there's a weird stalemate now. The Garleans don't appear to be doing anything.
I'm just curious if people realize the significance of all this?