He lost a little the reflexes by the third fights against Tarver... Jones did lose his chin... look at the first Tarver fight... flush straight lefts weren't doing crap to him, Ruiz hit him solidly in the side of the head, pretty much every fighter got in a few solid shots against Roy Jones JR... I've watched his career about 5 times, and he like any fighter who has foughten the top level gets tagged once and awhile in every fight especially when he would get reckless after overwhelming an opponent... He did have a solid chin... One time Toney did a 360 punch that clipped him cleanly, and he didn't even blink... Toney also punched off the clinch a few times, and Jones would respond with a quick punishing combination.