All it proves is that he can be sat down by lesser punchers than Broner, so we still dont know what his chin is like at the higher weights.Nah he faced a much harder puncher Zlatican that didn't force him to reverse or retreat once breh. 1 KD is not indicative of a bad chin, especially a flash KD. Is my point.
Zlatacanin isnt as big of a puncher as Broner was at those weights either, so yeah, Mikey got past him...but he doesnt have Broner's offensive skills and he's not Broner's size.
Imo, either of them can be knocked down in the fight.