Some of you guys are crazy...the two best fighters in the world is Silva and GSP. You can make the cause for jones but he is not tested yet. Cain is also not tested yet. I picked silva and gsp because they have walked through 11 and 8 top opponents in there class. Jones still has to fight evans,rampage,machida,randy,etc....cain has junior,mir,carwin,overeem,fedor,etc. GSp and Silva has defeated everyone there is to beat but each other. They have 23 sucessful title defence between the two. The hardest part is remaining champ.