Surprise,Surprise ! He goes from fighting the King of the World, to a guy who scrapes into the top 20. Collazo is a tough guy and a decent fighter, but I reckon it puts Khan in a lose/lose situation. If he wins, he's expected to and it hasn't proved anything, if he loses, he's finished at the top level.
IMO if Collazo is anywhere near his best, he beats Khan.