[There's a lot of things here that he's not sure how to unpack, and so he's going to sort of answer out of order.]

It's probably because the darkness here isn't as strong as the darkness at home. Not in that sense. [Oh?] We've always said you guys have light and darkness in you. Maybe it notices it wouldn't be as effective in you because of Xehanort.

[He's leaning on his knees, a hand propping up his head as he scrutinizes Saix for a moment.] The good news is eventually you get that kind of clarity at home, too. [And hence why he's actually being kind of okay with this conversation.] The bad news is you kind of tried to kill us because Xehanort wanted you to. We took care of it though.

[Casually...skirting around the topic of killing Saix himself. Ahem.] ...in the end? We finally get to be whole again. You, me, Axel, Xion and Naminé. All of us.