He's went on last at 16, 18, 20, 21, 22, and 25, so he's still far shy of Hogan's 9 turns at final match/main event.  I'm counting 4 and 9 for Hogan since at 4 he was top billed with Andre, and at 9 it was a billed double main event, plus the surprise ending match. 
  
Off the top of my head, other guys who were billed in multiple main events: 
  
HBK - 5 - 11, 12, 14, 20, 23 
Austin - 3 - 14, 15, 17 
Rock - 3 - 15, 16, 17 
Bret - 3 - 9, 10, 12 
Savage - 3 - 4, 5, 8 
Cena - 2 - 22, 23 
Taker - 2 - 13, 24 
Andre - 3, 4 
  
I remember 8, 9 and 11 having "double main events," I believe everything after that just referred to the final match as main event.  Thing get wonky with the split when you have a show like 19 that has Hogan/Vince, Brock/Angle, HHH/Booker, HBK/Jericho, and Rock/Austin all back to back.  Same goes for 20, which had 2 world title matches and 3 other matches that could be considered main events.