Will Cotto's stamina issues hinder any progression left in his career?

It seems that you can take Cotto into deep waters and drown him as Cotto just doesnt put the work in when training to deal with a high paced night.

Dude at training camp with all his family around and sh!t, breathing heavy after 4 rounds, does he do any road work at all?

Yes Manny has some sort of freak stamina, but Cotto just doesnt seem to be able to maintain a pacy fight.

Gassed against Margarito (plaster of paris allagations aside, although i think Manny beat Cotto worse than Margo did and Pacman didnt have any POP)

Gassed against Mosely

Gassed against Pacman

All above fights were fought at a high tempo excpet for the mosely fight, which once Mosely changed tactic (you here that Santiago? changed tactic) after the 6th Cotto suddenly lost his legs.

Is stamina really an issue for Cotto? Or am i making excuses?