Have you seen the guy slowplay anything up to this point? That observation would weigh pretty heavily for me on a call or not. While I think a smaller PP is likely, I don't think it's going to happen quite enough to risk your tournament life on what might turn out to be a coinflip.

I don't know how to weight the possibilities here but:

99, TT - 80% win
AK, AQ - 54% win
AA, KK, QQ - 20% win

This is definitely a play that happens quite a bit with AA but the all-in response does seem a bit strong. It might be consistent with a guy who would limp in EP with KK hoping for some kind of raise behind.

I dunno, personally, if I feel like I'm quite a bit better than these other guys, I might just get away from this one. But I might just be weak/tight.