He did, or you did? I think he provided something to measure with. I think you presumed it was the measuring stick for his argument, and so looked to dismiss it.In order to accept waterhead's data, I have to acknowledge that it is a valuable measure in this debate. But I never agreed to that. He decided that it will be the measuring stick. It simply isn't a good one. I pointed out several reason why. If he now wants to stick to his original claim, citing the data that he presented, that's up to him. But it's not enough for me to change my stance.
But again, consider the precedent you're setting here. "I have to acknowledge that it is a valuable measure in this debate". That is absurd. You're turning this into a kangaroo court.