I can see that, but he gotta peep the 160 landscape first. No reason to move up if there aren't any fights up there for him. 154 moves so fast and all the contenders are threats, by the time Mell become undisputed, and get a couple defenses, they'll be another name ready for him that people will wanna see.
I think if he follows what I stated 160 will be wide open and he can clean up there which will solidify his legacy. All the dudes holding belts hostage at 160 will be in 168 by then