I don't see that as a hindrance or a problem in the future. It's not that one of them has the status of Mayweather level wherein it's reasonable to demand more shares in revenue. Both Spence and Crawford are hoping to fight each other so I think there will be no problem about the split. 50/50 should do and will be arranged properly without a problem.
But before talking about Crawford, let's not conclude that Ugas has no chance. He has a chance and all boxing analysts are agree with that.
Well, we can talk about this after Spence will beat Ugas which is easier said than done. If both Spence and Crawford would agree a 50/50 split then this fight would happen, but if one will ask for a higher share which probably is Crawford since he is the number 1 now in their division, then we might see some conflict and this dream match won't happen.
I think up to 60/40, there will be no problem on both sides. Aside from the possible split, what matters in that fight is the reputation once all championship belts are acquired. It's another milestone in their career and an automatic high stake on their next fight.
But what if Ugas will win. It's a big upset.
Can't imagine for now that we will see a banner of Ugas vs Crawford as everybody is eyeing for Spence to win.