Rios is entertaining and all, but he's not and never will be on the same talent level as Cotto. Miguel would just tee off on him.
You pick the very worst 140lb version of Cotto? Dumbass. Cotto still wins, too skilled for Bum Bum Rios.
How the fight goes, depends entirely on the conditioning of Cotto. Rios is a guy that tends to get stronger as the fight goes on, and if Cotto is beginning to tire by round 8 or so, then Rios will have his moments. But I’ll go for a Cotto UD win or late stoppage (depending on how well Rios can handle his power). Would have been a hell of a fight.