Khan beats anybody who isn't bigger or a brute puncher or a volume monster or that can fight. He beats everybody else.
Last night also sucks for Kell Brook. Brook would have easily beaten Ali or Smith and picked up a belt. Munguia might be too strong for Brook.
Mungu would demolish Brook, almost as easily as Golovkin did. Brook is a pretty solid all rounder, but really nothing special, and taking punishment is not his forté.