Seems odd, when the monster read the disabler's heart, it was while the guy was copying him, and we know those thoughts where literally what he said last chapter, so it was reading him through a connection. Yet, he destroyed brainwasher's hero item and then transformed into her, using her power against her? Would have thought since it apparently has a connection between whomever hes copying, that it would have failed when she herself is unable to transform anymore, etc. I assume whatever the connection is, will be used in the fight against him, despite it not being as straight forward as it could've been.
Edit: While it could just be monster powers are the only ones that sync, that can't really be exploited, so doubt it. Must be that they have to be transformed at the same time, since brainwasher wasn't transformed when she alone was brainwashed. I assume it will probably be that he tries to use disable on the disabler and accidently gets himself too (it might just disable that one transformation, showing them the sync side-effect, so they only get a clue to how his power works to actually fight back instead of just having him out of the fight that easily)