Its very easy to understand.

Bob Arum was Floyd's promoter from 1996-2006.

Bob Arum fucked Floyd over. Bob owes him money. He's admitted he owes him money. He has declared that he will not pay him the money owed.

Floyd wanted a guaranteed $20 million to fight Oscar. Bob would not grant that. So Floyd bought his way out of his contract for $750000 signed to fight Oscar under his own promotional name and made himself $30 million.

Now, if you've been fucked over by a former manager would you ever give them the opportunity to make money off you again?

Floyd said he would fight Pac is he left Arum. Floyd guaranteed Manny that he'd be paid more without Arum than he would with him.