#1 Brock Lesnar

It seems like Brock is more about money than entertainment. He has retired from MMA twice, before making his third return to the UFC after being the WWE Universal Champion.
He was the second highest paid wrestler in the WWE, just behind John Cena, and worked part-time. Earlier in his career, he’d left the WWE to go into professional football in search of a better deal.
He’d even come forward to comment that he was leaving MMA because he could "work part-time with full-time pay" in the WWE.
Keeping all that in mind, Lesnar was returning to the WWE once again just to be a part of Crown Jewel’s main event because Saudi Arabia showers famous sportsmen with dollars. Now that there is a possibility of Crown Jewel being canceled or moved out of Saudi Arabia, there will be doubt whether The Beast will mark his return or not.
If Crown Jewel is moved out of Saudi Arabia, and the WWE plans to use the same card for another event somewhere else in the world, or in the US, then they will probably have to pay Brock millions out of their own pockets for him to be a part of the Universal Championship match.
If the event is canceled altogether, will we even see Brock Lesnar come back for his rematch for the title at all? It seems unlikely, as it would hinder his training and healing process for his UFC return, and if he doesn’t find it lucrative enough, he won't return for the Universal Championship any time soon.