A
There's no benefit to the biggest fight they could possibly make with Jones? What on earth are you talking about?
It's not the biggest fight the UFC could put on for Jones (getting Peireira to fight him would be the biggest fight), and even if it was, it the gap between it and the 2nd, 3rd, and 4th fight would be minuscule for a multi-billion dollar company.
Also, you're saying 'what on earth am I talking about', as if your idea is so great and the UFC is considering this, when they're not, precisely because it is not to their benefit (i fit was to their benefit, then they'd at least consider it, that's common sense).
You think the UFC is going to go out of its way to
- Negotiate with someone who recently blew them off and already has shown demands that the UFC was not interested in.
- Go through a bunch of red tape by talking out the logistics with PFL.
- Give the PFL a ton of exposure for zero reason.
- Risk Jon Jones losing, which in turn makes the UFC look bad. Your point about Jones retiring after so it doesn't do that makes zero sense. It's irrelevant if there will be a different heavyweight champion afterward, the UFC would have donated its resources to just making a fighter not in the UFC richer and more marketable.
- When Jones vs ____ would likely make just as much money. Even if Ngannou moved the needle, which there has been no evidence that he does, it'd be like 100k more buys. They wouldn't even be able to use Ngannou either afterward.
The UFC is bigger than just finding Jon Jones someone to fight for a random weekend (as if Jon Jones cleaned out the division, he literally fought one guy, and now they're going to start co-promoting for a guy who is going to retire anyway?). You're thinking small as if they are Bellator or some shit.