Who's next for Kamaru Usman, Rose Namajunas and Justin Gaethje?

The champs retained their gold at UFC 268 and the challengers are lining up. Brett Okamoto plays matchmaker.

source https://www.espn.com/mma/story/_/id/32570406/ufc-268-next-kamaru-usman-rose-namajunas-justin-gaethje