Out of these 3 fighters who do you think put on a better show against Chino? Maidana is definitely not an easy opponent to look good against.
Khan, although with Maidana I don't really think it matters. He can fight the best in the world in Mayweather, a has been in Morales, or a major underachiever in Khan and it doesn't matter. He just goes in for a tear up and makes it a fight.
Alexander did it just find, and if Morales even had 10% more in the tank he would have dominated too.
Khan would have gotten stopped if it wasn't for Fair but Firm saving him. I mean look https://www.youtube.com/watch?v=g4ewJ-WipKA
Khan didn't force a pair of foam gloves on Maidana and Morales at least had the decency to inform Maidana of his glove demands well before the day before the fight. Neither one of them were viewed as heavy favourites over Maidana, either (the complete opposite was the case for Morales.)