I think Berto poses the biggest risk, he has helacious handspeed and a viscious meanstreak of late. He seems to be sitting down on his punches and like Pac seems to be punching thru people now instead of tagging them like he's hitting a speedbag.(if that makes sense)
Not to mention his uppercut is probably the best in the business and it comes at you like lightning

Sure he went life and death a few times against Estrada and Collazzo..
Estrada gave Mosely fits if I remember and no one and I mean no one looks good against Luis Collazzo.