I mean I wouldn't just take anything if I was Crawford. Point being Bob Arum it wasn't always pure dollars and cents, he always wanted to set up fights that would favor a fighter over another. If Crawford loses he loses interest for ppv fights. Bob knows that.
But on the promotion side, with Bob Arum's power and influence, he can really make a boxing match always sold out since he knows how to play the business.
Unfortunately, the reason why he kept Terence Crawford against a much more dominant boxer is because of money but Crawford also benefited from what Arum did to him in terms of decent contract = money. Crawford bags lots during his tenure with Arum.
Now that Crawford stays away from Arum's shadow, I'm pretty sure that there's no problem with him anything about the purse split. It's now up to Spence to say the final deal. But since the information was limited on the news, we are just guessing things here why the fight isn't officially announced yet. I hope soon they will release at least a small important information.