I think the biggest problem is that Margarito was saying he can't fight again for a bit because of injury, and now is going to fight on the Cotto-Urkal undercard and likely not against Williams. His whole excuse for not fighting Williams was the injury but now it seems the injury isn't bad enough to keep him from fighting. Maybe I'm reading it wrong though. The only reason I could see holding out to fight Cotto would be if he really thought he had a chance at losing to Williams, which would probably throw off the chance of meeting Cotto after his fight with Urkal. Its not like choosing whether you are going to fight Williams or Cotto though. Margarito could fight the mandatory on the undercard then if he wins meet Cotto whenever they were talking about meeting.