i think bradley will win JMM is old but still is fightin at a high level. by the time he does fight bradley if he ever will bradley will beat him.
Difference between Bradley and Diaz, and there are many, is that Bradley steps off the line when he attacks you, he does not come in the front door swinging hell for leather. Bradley is also quicker of foot than Diaz, he is capable of getting his feet into position to hit you, but also capable of moving out of position before you can react to him.
All the physical advantages go to Bradley. But, he swings wide at times and gets drawn into brawls...Marquez would pick up on that.
Bradley still has a bit more to prove, but he's definately at a higher level than Diaz and Katsidis. I would pick him to beat Marquez by UD. Marquez hasn't shown he can handle any 14o lber, let alone the best. Nor does he seem in any hurry to do so, which says alot. Talking about how he'd easily beat these guys and actually doing it are two different things.