"The only contender that makes sense is Belal Muhammad. It's just that he's been in the top 10 for a long time and now he's in the top five. What fight still makes sense? I think it will take time to build another character that can challenge the champion," MMA Junkie quotes Usman as saying.
Recall that the 35-year-old Muhammad has not appeared in the octagon since last May, when he took a points decision over Gilbert Burns.