He is not the only one. [ Between the absence of panic from Vash and him being rather bad at lying, the calm statement is unlikely to be false. ] He is the one both of them know, on the other hand, and the one who would be really hurt if he met you. But if you want to be cruel to him, try to seek him out. I make no promises that I won't try to stop you.

[ Vash's arguments earlier, about Nai needing Vash at his fullest. While not necessarily all he thought? They were also not lies. Because even as horrified as he is right now, he still loves his brother. ]

You probably do not remember, nor care, but they both would protect children no matter the cost. That is why he is the one that the focus was on.

And no, for my part, thank you. I'd rather meet the ones who will come, if you would let me.