I'd wait for Francis' side of the story
Why wait ? Everyone already know what Francis Ngannou would say. Contract, contract, contract. Without giving particular details. I think he wants things to be following: he fights a guy and then go immediately to cash desk for cash money. Wake-up Francis Ngannou! We are in modern civilized world, where everything and everyone are bound with contracts and obligations. He probably wanted to be in biggest MMA promotion and be free to fight and to do whatever he wants. That does not work like that. Congratulations on being unemployed now.
Because there's always at least two sides to every story and it seems like you've already made your mind up here for some reason. Why aren't you accusing Dana White of being greedy offering terrible lowball contracts to even his biggest superstars forcing them to go elsewhere? UFC contracts are already notoriously pretty stingy and also don't allow you to get paid by external sponsors for your kit etc. Ngannou is literally losing out millions because of that. I'd argue he's losing far more than what the UFC are giving him even on this extended contract that will have been essentially a slave contract for a ludicrous amount of fights like the 8 Jon Jones is now on. It might not even be about the money for Francis but how restrictive the contracts are and he just feels he will be better off elsewhere. The UFC won't allow him to box either and the potential fight with Tyson Fury might be more lucrative than his entire UFC contract. I don't blame Francis or all the other UFC fighters that are leaving in droves either. When Nate Diaz is getting paid double for a random fight than what Francis is getting for a title fight against one his most challenging opponent you know something isn't right but before you make your mind up I'd at least wait to hear what Francis has to say.
The UFC contract is squeezing them and they don't even have the chance to make money somewhere else because the contract says so. It's kind of like modern Gladiator/slavery in the new age but only a few got the balls to fight back because Dana or his org can actually ruin thier lives.
Demetrious Johnson doesn't even want to speak anymore about his way out. Francis may actually not get into some fights even in other organizations like PFL or Bellator. Apart that Ngannou is scary to fight with, Dana's friends are all over. It's going to bite Dana if he gets an opportunity in boxing with Tyson Fury. I think this is possible since Francis is already famous. It's just the demand for this fight that has to work out.