Most of the MCU, Cap is my favorite.
But the honor in this movie goes to the Credible Hulk.
Changing the past doesn't change the present, that didn't stop old man Steve from keeping his shield for the duration of the battle while his shield was shattered, so there were two shields for the sake of passing the legacy to Sam Wilson. I think it's an alternate timeline that crossed in with the main story's timeline.
I think I just explained how they can use Kang effectively for the MCU, but I'd rather they avoid using that time travelling maniac.