Fighting for the title and agreeing the Champions terms for rematch and % purse I am sure could be challenged in court by Usyk but it is far easier to accept the conditions of the contract if you can not get better elsewhere.

Rahman was forced to rematch Lennox when he clearly did not want to.

Ruiz accepted the rematch because he was not going to get anything more from Wilder or others.

50% of this purse is more than what Usyk will get anywhere else. Besides if AJ is damaged after the first fight it could be easy money for him.