It didn’t matter that he had different faces, as long as he has the same heart. He can’t tell where one begins, and where the other ends anyway, so he refers to themselves as one collective entity.
He doesn’t expect people to understand the bond he has, because even in the midst of fierce competition, he thinks he’d rather lose for his own sake, although for his sake he’d rather win. As always, it would be an insult to lose on purpose, and so he sees the rivalry as a way to demonstrate his love and care.
He doesn’t consider himself “kind”, but as long as he loves and is loved, he can consider himself to be better than what the world calls a brother, and in this way he feels he can’t lose.