Amir had his pick of the trainers. He chose Rubio. Clearly he made a terrible mistake - or is looking for a scapegoat after his loss.
I'm a fan of Amir Khan, but he wanted a world title shot, so he can have no complaints about being made to fight a big hitter. If he wasn't ready for Prescott, he's not ready for a world title shot either.
I hope Amir can make it to the top, but it's no good pinning this one on the trainer. Amir needs to improve.