Just because you call out the champion doesn't mean you get to fight the champion.
I, personally, wouldn't mind this fight like everyone else in this thread, though, but that's because I followed Brooks' strawweight career from before he even fought Sarumaru and know he's a great, elite-level fighter (though he's gotta figure some things out with his style since he can't use a size advantage-- he was a gigantic strawweight-- to muscle guys around like he did at strawweight, but that's the case with any fighter moving up a division.)
Besides, wasn't it confirmed that the Pettis-Cejudo winner would get the next title-shot? And even if that doesn't pan out, Formiga's one or two wins away from a title-shot (and he's got the skills to give Demetrious more problems than any of the strong wrestler-kickboxer hybrids that Demetrious has been fighting for years do-- remember that Demetrious struggled with Tim Elliot more than he did with Cejudo just because Elliot brought other stuff to the table), and it'll be EXTREMELY difficult to deny Benavidez a title-fight if he wins another fight or two (or if anyone beats him in that time.) And Brandon Moreno's still in the mix, and Ben Nguyen's jumped up as a contender.
