Thanks! Not sure what you mean with accessing the breaker from outside...wait...could you get outside the house? :D because that's not intended, lol (at least not presently, that could be fun though).
As to the man in the cap, he was -supposed- to be there for the ending, which was indeed supposed to have to do with whether or not you fed your brother in his room or not. Basically after the end, there'd be a cutscene where a survivor (the man in the cap) breaks in. If you fed the brother in his room, then the man in the cap doesn't find him, and you just have a conversation with the survivor. Otherwise the survivor will see your brother and shoot him ("bad" ending? or "good"? who knows). Anyway, I obviously didn't have time for such an elaborate ending cutscene, but that had been the plan :D