Billups is definitely Ace, yes. That scene with the orgy and Billups just chilling and reading cracks me up every time. Depends upon how sexually attracted he is to her. Asexuals can be attracted to people, even consider them hot/beautiful/etc., but their desire to have sex with them may not be there (though it can be if you're dedicated to a partner). We'll have to see how Rutherford advances with her going forward. That would be awesome if Tendi is Ace, because considering her culture, it would be a big smack in the face of stereotypical Orion women, which would be a nice change of pace.