Probably not. Although there's a VN (that I won't name) that I played some two years ago that had an ending where MC would cheat on the main girl by going with her friend instead. The path was available and came late into the game, like, 5th episode out of 6 episodes.
I wonder if DPC is doing something similar with this. You couldn't really 'cheat' on anyone during the first two seasons since MC was playing the field. But now that he's devoted to a partner(s): could it be an alternative way for him to cheat on the main girls? Particularly M&J and Sage.
Probably reading too much into it, but I wouldn't be surprised if she was the catalyst for it, The other girls are too risky for an already committed MC since they are either the HOTs or engage in the college's gossip column. And for Isabella/Jill there's already the up-and-coming red head redemption girl perfectly setup for it all.