"What an interesting theory!" she said brightly, stroking Crookshanks’ fur while she talked, as the gangly young cat dozed on her lap. "I certainly didn’t read anything like that in The Rise and Fall of the Dark Arts or Great Wizarding Events of the Twentieth Century, but then they did have a noticeable Light bias, didn’t they? I don’t see that the "power of love’ would do much on its own, but then sacrifice does have an awful lot of power, doesn’t it? I’m surprised there wasn’t more speculation about that aspect of things, given how his parents died for him.