honestly....Cotto's better at just about everything minus handspeed. You need to have enough pop to hurt Cotto or at least enough to make him think twice, bradley doesn't posess this. Bradley does have great resolve that might get him a couple rounds but 9 times out of 10 I'd pick Cotto by stoppage.
You don't need a big punch to hurt Cotto...Margarito was a career arm puncher. Timmy is too mentally tough and strong for Cotto. i expect Bradley to beat him in an action packed firefight.
Bradley's big ass head might be a genuine factor in this fight. If he can open a cut (or 2) on cotto's face he might have a good chance.