I still think that the MC has a deeper relationship with Sage than with any other LI, even if it's not defined at the moment. Considering the best relationship possible in all routes.
That's why she's my favorite. Even their interactions are well done, Sage always imparts some knowledge in the MC, about how things work in campus, how to run a fraternity/sorority, etc...
She at the moment is the LI that is always honest with the MC, for better or worse. The only "lie" in their relationship at the moment is that she's still with Chad.
Anyway, i also see Jill being the first girl to ask for commitment. Maya and Josy were weird in episode 5, at the end of 4, i thought there was already something like that, after the library scene for the guys on their routes. Anyway, Sage i see being one of the last, because i can see her next episode trying to get back with Chad or something like that.