I honestly don't know how DPC will introduce Zoey into the main story without following her route, and even in her route she's not a student at B&R and we've only seen her at parties or at her house. (I don't like Zoey, to be honest). The only way I can see it happening is if she gets a job at “The Pink Rose” as a stripper, and even then, in any route with the MGs, continuing to interact with her beyond saying hello at parties would be forced to the limit.
I would say that the story of Quinn and Riona and the dealers/Vinny will be more interesting with police investigation and that they are also related to the plot of Jill's sister and her death.
As far as MG is concerned, Bella and Josy, I think it would be more than justified for them to be notable in this chapter.
I don't see Nora and Cindy in the top 5, except for Sally, who could have more weight than them with the Magnar and Tribetas issue (possible traitor or snitch).