He lost to Arona the first time. Arona is a rather unique individual, very strong and BJJ, but he still could'nt sub Silva.Liddell's not that powerful to tie Silva up with the leverage of BJJ in his wrestling. Henderson is a world class wrestler, skills without the HW power being a middleweight, Rampage is another wrestler who's massively powerful without the BJJ. Henderson and Page were flatout dominated by Silva.
Hunt did win, I thought it was an unfair matchup to put Silva against an impossible to KO Heavyweight K-1 man, the same could be said of matching with Mirko, but Silva's boxing is improved, his defense is more technically adept than it used to be from recent pro boxing coaching. Heavies are all that's left, he's gone through everyone of equal size so they put him the OWGP.
Silva's traded with Mirko, Hunt,Fujita, Rampage and Henderson, those are some hard hitters besides some cans he went right through.
Silva goes balls to the wall when he does'nt respect an opponent's striking, he's more approriately careful when he does, and when he does comes, he's a mean no stop mofo round after round.
Chuck has a puncher's chance if he can catch him flush, otherwise I can see Silva putting a brutal Rampage style KO on Liddell.