Can you link me the interview? Even if he thought it would be cool, but I believe he had had the first reason to put the tattoos because they look almost the same as Ulti... and that first reason must be something... like Z and U are related or whatever.

BG-57, not all people in the game wear tattoos, only apart from Zell and Ulti as far as I recall. That's why it is..

Ultimecia not only came from the future, but she lived before past and present because of time compression. At some point, yes, Ultimecia came from the future, she gotta have a family in which created her, otherwise she won't exist. That family consisted of someone involved. I don't wanna add more details because it's kinda part of R=U theories.