Given that the argument has already been made that Amon ties directly to the crystal tower I don't see how Yoshi is getting any lore wrong. It's not like he stated it was a prominent figure in the story of final fantasy 3. Just that he is related to the crystal tower and he is from ff3.

As for the coloration... that's being just a little too persnickety. I mean, what next? Complaining that he's not a horribly rendered 8-bit sprite? Complaining that he's not the dapper skeleton he seems to be in those 8-bit renderings?

It would make far more sense from a lore perspective to have him continue to be Amon tied to the crystal tower from ff3 with no real story or lore connections beyond that rather than to pluck a character out of his story and then try and repurpose him for another game and another story.

P.S.

Apparently Noctis types faster than I do. ><;