To be fair only Calzaghe has proven himself a great fighter so far, and I guess stateside at least his importance from an all time historical perspective may still not be the level of Jones Jr, Hopkins, Mayweather, Toney or even guys like Morales, Barrera, Pacquaio, Mosely etc.

Kessler is very good but has not yet proven he is great. Wins over Beyer and Mundine do not an elite fighter make. He needs to win the Super Six to be considered great imo.