[-] Poligrizolph suggested:
Hang on, if we can't control Heat Guy, why can we control Johnny? She's not a Hat-bearer, either.
You don't control Heatguy because you haven't given him any commands other than demanding that he appear more, a wish which I mercifully grant even though Heatguy sucks and is awful and I'm totally rooting for his enemy.
Johnny is on your side because she was (and still kind of sort of is) in Hearts' party.
The brute discards Johnny Test in a violent fashion.