Mas has it. And Usman has the actual belt.
Assuming Mas gets next title shot...you have your answer. Winner takes both.
That will likely be Usman wrestlefucking Masvidal for 25 minutes, which is totally what they had in mind when they made up that BMF thing I'm sure.
But it's not fair that Usman has to put his belt on the line and Masvidal wouldn't, right?