[He answers Roxas' jab first, lighthearted despite the glint in his own stare]

Oh, I knew you too. And Axel. [A pause, and he can't hide the way the tip of his mouth turns down] And Saix.

[Then, to this "Toxona":] I joined at the same time as Axel and Saix, and left before Xion decided to. The Organization's goals didn't line up with my own.