If they fight now I think Casa schools the younger fighter. He's way to slick and the wreckless volume punching is just going to get Diaz in more trouble. Casamayor will rough him up in there with his usual questionable, but effective tactics. It just doesn't seem like a good fight for Diaz at this point, and I'm sure his team knows this. Much respect if they do decide to take this fight though I highly doubt it.