Collazo is a decent fighter nothing moe, i think Rick will look awkward trying to find him for first 3/4 rounds, but Hatton is to strong for this guy and will stop him maybe 7/8 rnds.

Kahn will be on the Calzaghe undercard at Cardiff July 8th, not to sure if he is figthing prior to that, and your last point not to sure to be honest.