Unless DPC is still hiding us the real "bad guy" of the game, Quinn seems the obvious troublemaker for what it's to come. At the moment, we all can see how she and her shenanigans can hurt the MC and all our main LI... except Bella and JIll. Which is what have me intrigued. We can choose a CHICK path to pursue one (or both) of them while neglecting M&J and obviously Sage, and of course we can do a run avoiding Quinn and her dirty business as much as possible. So anything bad happening to her would only affect the MC in a very slightly way (and mainly because Maya is Derek's sister). But I can't see how it could affect Jill and Bella. In this route I'm saying, DPC might have in mind another shocking event completely unrelated to Quinn. Basically because if the only 'turning point' is something related to Quinn, it won't cause an emotional impact in many players, and I doubt that's an expected outcome for this game.
Bella's secret is the main suspect for that alternative shocking event, but I'm failing to see how it could affect Jill, who seems to be in the known. So my guess is that we're still blind about the greatest turning point in the whole plot