Robbery scheme didn't make sense
They wanted Bugsy to think Jenkins was throwing the fight so he would bet his money on the white boxer, and then they would end up robbing Calhoun's booking joints to get all the money.
But if Bugsy did bet his own money(I think it was like $300,000) he wouldn't bet it at his own booking joints, he would bet it with someone elses. So the money Bugsy bet would not be with the money they stole.