I gave you the answers you sought. You didn't seem to be listening.
[Bull-headed to the end, Zero. He almost wishes Ruka hadn't gotten in the way.
As Yuuki speaks, though, and about Sara, even, he knows isn't right. Yuuki was there when the Parent Metal struck out, pierced Sara and took one more Pureblood out of his way. Why didn't she remember that?
And yet, she doesn't seem concerned about it. She wants a truth he explained, albeit vaguely.]
The truth you so desperately seek, Yuuki, is very simple. Haven't you suspected it?
[Felt it in Artemis, knew from what actions he had taken, what clams he had made? The Pureblood King, declaring war on the purebloods themselves?]
I will erase all purebloods from existence, because it is 'her will'.
[Himself included. And Yuuki... though his plans are quickly changing, will no longer need to bear the weight of her pureblood lineage in the end.]