This is the reason I say guys should be much more afraid to battle a guy like Mook than any of the younger cats who people think are better by talent but just don't have the name (such as a Nitty or JC); at least losing to most guys it's just bars. The elites from that OG era (Mook, Lux, Hollow, Math) expose shyt about you to the world that has gotta burn your soul on a personal level.
I don't think Mook would expose whatever the shyt is (all speculation of course) if they don't actually battle. It seems more likely he would either save those bars in case they DO end up battling in the future (doubtful obviously, but still possible) or if he did let it out, it would be in a random interview, which wouldn't do anywhere near the damage it would do in an actua battle.