RJJ nodoubt... Calz has beated a bunch of good fighters, but none of the greats. RJJ would KO him within 6 at his prime.
jones wins most of the times. but calzaghe can beat him, i'd say once in 3-4 fights. anyway, it's going the distance and it's competetive- no one knocks Calzaghe out at 168.
I know it´s an "if", but IF Kessler dominates the SMW/LHW divisions for the next 4-6 years and he puts up some really great performances, then it will put Calzaghe´s win over Kessler into perspective. And I am not too sure about that "KO within 6"!!!
Calzaghe has a very good chance to beat a prime Jones. Noone else could do it and Calzaghe´s swarmer stile, relentlessness and quick reflexes would trouble Jones every minute of the fight.
Jones would get a UD between 4-6 rounds. Calzaghe would be competitive but Jones is a freak of nature and would be too good for anyone.