Honestly, a lot depends on the outcomes and on Fergie.
That was a serious fucking injury/surgery Fergie had. And despite his prognostications of being ready September/October, I would be surprised to see him fighting before January/February. Maybe even later if there are complications.
If McGregor loses, that is the best case scenario for the division. He and Diaz can then go about their trilogy fight without holding up the list of legitimate contenders. Even if Diaz wins and McGregor loses, Diaz will opt for the trilogy fight for the $$$.
If McGregor and Diaz both win, that is the worst case scenario for the division. Then Poirer and Fergie are going to have to wait or take a fight. Either against each other or Lee.
If Khabib wins, he will fight Fergie if he is ready, Poirer if he is not. If Fergie is ready, Poirer will probably wait for the winner as opposed to Fighting Lee, which will put Lee in limbo.