Yeah even though he had the frame to cover several weight classes, 135 really seemed to be his ceiling. At best, can see Maidana getting dropped, but would get up and probably send Chico repeatedly to the canvas before the fight is eventually waved off.
Maidana is superhero tough. There isn't another fighter at 140 who would've gotten up from the body shot Khan nailed him with. Given his ability to absorb punishment and toughness, along with his ability to crack, I'd say Chico gets worn down late in a war.