There's a pretty fundamental difference in the two defeats though, among other things. Roy Jones respected Antonio Tarvers ability, and was actually throwing punches himself until he was KO'd. All the Silva fight really showed was that any capable fighter your size can knock you out if you offer your chin like that repeatedly. It was a lot different than Jones showboating while still in balance and position to counter, Anderson was just being a flat out clown. Now of course he's gotten away with it before in spots, but that same thing could have happened then.