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.