I've watched Bailey pitch in a couple games and personally, I think he looks really good. He's throwing loose and easy, locating his fastball and not getting frustrated when the results aren't there. Dusty said he was pitching in the minor league game to 'work on some things'. It's almost impossible to tell what he was working on without having watched the game. Did he throw a lot of change ups? curves? fastballs? splitters? he may have been trying to fine tune his location on one of those pitches. Who knows?
Concerned? Not at all.