Originally Posted by Eddie
Liev Shreiber was great. If they bring him back, just explain that his mutation made him more feral. Say he was with Magneto in the first film because his memory wasn't working properly as he became more beast-like. He grabbed Logan's tags because they triggered a vague memory.
If they don't create a new timeline, say that A. Sinister cloned him since Sabertooth does work for Sinister in the comics or B. he survived the fall from his healing factor.
With regards to X1, say that Sabertooth didn't bother to bring up Wolverine since it wasn't important or that Sabertooth also had his memory wiped. There are ways to bring characters back/handwave things.