If we’re looking at wins over top opponents in their primes/difficulty of the wins (ie. winning vs bigger elite opponents) and we're not counting the performance itself, then
1. Hendo: big nog, babalu x2, ninja, Busta x2, Vitor, Wanderlei, palhares, Franklin, bisping, feijao, Fedor, shogun, lombard
2. GSP: Hughes x2, BJ x2, Fitch, Trigg, Diaz, Condit, Hendricks, Alves, Shields, Kos x2, Bisping, Sherk
3. Reem: Vitor x2, Igor, Kharitonov, Hunt, Rogers, Werdum x2, Brock, Nelson, JDS, AA
4. BJ: Din, Uno, Serra, Gomi, Hughes x2, Ludwig, Renzo, Sherk, Ken Flo, Diego, Fitch draw
5. Big Nog: Coleman, Herring, Sapp, Schilt, Ricco, CC, Sergei, Werdum, Barnett, Sylvia
6. A Silva: Franklin x2, Marquardt, Hendo, Griffin, Sonnen x2, Vitor, Okami, Sakurai, Brunson
7. Frankie Edgar: Franca, Sherk, Maynard, BJx2, Olivera, Mendes, Swanson, Yair,
8. Bendo: Edgar x2, Cerrone x2, Varner, Diaz, Thomson, Gil, Masvidal
9. Werdum: Reem, Aleks, Gonzaga, Vera, Bigfoot, Fedor, Nelson, Cain, Browne x2, Hunt
10. DC: Barnett, Mir, Stipe, Rumble x2, Nelson, Bigfoot, Hendo
If we’re looking almost entirely at just a list of names with accolades and top 10s at the time the fights happened regardless of how weak the division or opponent was at said time, Then
1. Fedor: Big Nog x2, CC, AA, Tim, Schilt, Hunt, Mir, Randleman, Coleman x2, Rogers, Herring, Hunt, Lindland, Rampage, Chael, Babalu, Arona, Choi
2. JBJ: DC, Lyoto, Gusx2, Glover, Rashad, Vitor, Rampage, Shogun, Stipe, Bader, Santos, Gane, Sonnen, Reyes, Santos, Smith, Chael
3. Hendo: big nog, babalu x2, ninja, Busta x2, Vitor, Wanderlei, palhares, Franklin, bisping, feijao, Fedor, shogun, lombard
4. GSP: Hughes x2, BJ x2, Fitch, Trigg, Diaz, Condit, Hendricks, Alves, Shields, Kos x2, Bisping, Sherk
5. Reem: Vitor x2, Igor, Kharitonov, Hunt, Rogers, Werdum x2, Brock, Nelson, JDS, AA
6. Big Nog: Coleman, Herringx3, Sapp, Schilt, Ricco, CC, Kharitonov, Werdum, Barnett, Sylvia, Couture
7. BJ: Din, Uno, Serra, Gomi, Hughes x2, Ludwig, Renzo, Sherk, Ken Flo, Diego, Fitch draw
8. Werdum: Reem, Aleks, Gonzaga x2, Vera, Bigfoot, Fedor, Nelson, Cain, Gus, Browne x2, Hunt, Big Nog
9. A Silva: Franklin x2, Marquardt, Hendo, Griffin, Sonnen x2, Vitor, Okami, Sakurai, Brunson, Maia, Leites, cote
10. JDS: CC, Carwin, Cain, Gonzaga, Nelson, Hunt, Rothwell, Stipe, Werdum x2, Mir
11. Barnett: Randy, Aleks, Big Nog, Kharitonov, Mir, Schilt x2, Nelson, AA, Rogers, Hunt
Edit: Aldo needs to be in there after GSP on both lists.
Faber, Cub, Edgar x2, Brown, Hominick, Lamas, Mendesx2, Munoz, Font, Vera, Zombie, Kenflo,