Jones had huge size and length advantage at LHW that he won't necessarily have at HW. When he did run into a moderately skilled guy with similar size and length at LHW like Gustufson he lost but they cheated. I was thinking at the time that even a HW like Werdum with length and skill would have schooled JJ at HW or somebody like dos Santos would have KO'd him back then because JJ has always talked about moving up to HW. Now, not sure as I don't watch much anymore. JJ has always been hitable, he just has a good chin for LHW but he's not walking through those wide open shots to the chin at HW like he did again Machida. You let a HW hit you and you're going to sleep. People think about JJ in terms of how good of a striker he was but he is probably one of the top wrestlers in the history of MMA. He took Olympian Daniel Cormier down and nobody thought he could do that.
FWIW, I was a huge Fedor fan while he was at Pride. Those were the greatest days of MMA. Fedor rising up on that elevator as they played old time Russian music of some kind. The Japanese called Fedor "he who does not fall" and even Mike Tyson in his heyday wasn't that exciting to me. Nothing compared to a Fedor fight.