The following is an excerpt from an interview with Fabricio Werdum, from TATAME Online, translated in english:
Why did he go to the UFC instead of Pride?
Pride didnt want to pay him what he asked (for Pride 33) and so they talked to the UFC and they offered double of what Pride said.
If we have to fight we will. Says they wil try to avoid it but they were from the same team, have the same manager, and are friends. Says CroCop wants him to come back to train.
To read the full article (written in Portuguese): click here.