Your expressions are perfect. Axel *would* be the only one to get 'reactions' out of Saix... Knows what 'buttons' to push. I still think it could be some of Xemnas' narcissism coming into play... Similar face, eye, ear & hair shapes to his. (Not that Saix isn't 'magnificent' enough to get it on his own, of course.)
I love how Xemnas made his 'fellow' apprentices #'s 2-6, yet number 7 ends up second in command. Not that I'd trust Xigbar to bring me coffee, let alone run the inner-workings of a world-that-isn't, *&* continue to feed (+write & read long complex, unnecessarily verbose sonnets for) Kingdom Hearts.