This one seems a lock. Gilbert was already meant to be facing Usman at the main event at UFC 251 before a positive test result scratched him from the card. He's the number one contender, has been on an absolute tear in the division and Dana White has already stated this is the fight to make.
The only other person close to getting the next title shot would be the overlooked Leon Edwards who is stranded in the UK, unable to travel or even train normally. However, his best win is also against Rafael Dos Anjos who is 1-4 in his last five fights and ranked ninth in the division, so he probably needs one more big win to solidify his shot, and he'll want to stay active.
While Masvidal was game, 'The Nigerian Nightmare' dominated him with his grinding clinch work, but with Burns' skills being just as effective in his grappling as he is in his striking, this is one hell of a compelling match-up.
Hopefully Burns recovers swiftly and this one can go down before the year's end.