I'm landing harder on Jaime as true hero.

The people most responsible for the problems with the walkers? The two heroes, Dany and Jon. If not for them, the walkers would be stuck north of the wall like normal. The Prince (Princess) Who Was Promised? Yeah, for the fucking Night King. To give him a dragon.

I still can't see how Bran plays into this. But the true hero, Jaime, did try to kill him in the very beginning. If Bran is the NK, then the theory of Jaime as true hero is untouchable.

The visions, the prophecies, all a ploy by some combination of Bran/Bloodraven/Night King/Children to get that ice dragon. If Bran really is NK and since Jon/Dany are responsible for the calamity, Jaime will be the one to kill Bran/NK in the end, which makes the story come full circle from episode fucking one.