Anderson can and has headlined a pay-per-view event without a belt on the line, I think Cain could if he doesn't win the rematch coming up against Werdum, but who else on the UFC roster can top a PPV and still draw?
JDS
Machida
Bisping
Frankie
loads and loads of talented fighters but they really lack those marquee stars with huge marketing power.
Jon Jones
George Saint Pierre.
Anderson Silva.
Nick Diaz.
Overeem
Rampage
Rumble
Card -
I'd let him hit it in the morning
CM Punk