I think there's a good possibility Joshua will end up getting a 70/30-60/40 split in his favour against Usyk. He got a bigger split against Ruiz in the 2nd fight despite being a challenger and Ruiz the champ. IMO who brings in more PPV views/tickets matters, but if you are a unified champ, on PRINCIPLE you deserve to walk away with AT LEAST 50% of the cut, regardless of how many people care about you and watch because of you. If I was Usyk I'd not agree to anything less that that. Why become unified champ if your challengers are going to walk away with less?
Boxing is a business first and foremost, the bigger draw will always get a bigger share of the purse, that’s just the way it is