Ha ha - the variation there is based on some of your choices when you first meet him in the mess hall if I remember correctly. It's not based on your route because there aren't really distinct "routes" per se until the very end. So things like that will tend to be based off specific earlier choices more than who you are targeting a playthrough.
Kav is a gremlin and the mental image of him curtsying to the MC does make me laugh. \(￣︶￣*\))