Still unusually speculative; we're told previously that an Imperius debt is not a life-debt, so it already has a burden of improbability (did they misspeak or simply mean to imply that a debt of some sort is created without reference to how heavy it is?).

And the latter suggestion, while very clever, has the problem that it requires the numbers to work out, so we couldn't conclude that it will work without numbers, so a fair author will not expect us to work it out without numbers, Eliezer is a fair author, and Eliezer hasn't given us the numbers. (We don't know what the margin for conviction is, or how much of the margin is former Death Eaters who used the Imperius defense, or that they all said it was Voldemort who Imperiused them and not, say, an unknown Death Eater whom Harry did not defeat.)

Well, we'll see in a few days.