Bad comparison. Jones chin is made of chinaglass and Margo's is some combination of steel, granite and marble. Glen Johnson is no KO artist. Whether or not Jones will be able to withstand even Calzaghes power is not agiven.
Read through the lines bro....the fight with Margarito-Cotto had everything to do with the chin factor but Jones-Calzaghe doesn't ! Calzaghe's power will not be the main issue for RJJ.... And by the way...many of you need to get over the china chin thing...Jones probably has an average chin but no less than most !! For a guy that started at 160, he handled getting hit flush by a heavyweight quite well in case you already forgot...