Maybe Crawford and Mayweather Jr. have an agreement that they don't want to disclose in public. Way back a few months, Mayweather told the public that if the fight will happen officially, he's the one that will announce it first and only believes in him, not another announcement by anyone.

Adding to that, he also said that he/they will promote the fight. Mayweather won't just promote the fight without any advantages or benefits to him. He won't be called "Money" for nothing. We can now assume that Mayweather holds the right of promotion to Crawford.