You all worry way too much about Zoey. Elena, Catrin, Jamie and the MC have told us all what will happen.
When the MC decides on a LI in EP8, the choice is already made. The MC already knows which girl his heart belongs to. What did Elena say. She said that there can be trouble if the MC is not sure. To what extent the LI's will accept Zoey as the MC's friend remains to be seen. But even there I don't see a problem as long as the player (MC) stays true to himself.
Once all the LI's have been rejected, Zoey will be presented to the MC as an alternative. After all, she is his ex-girlfriend. But that's already being rubbed in Catrin's face. Catrin still hangs out with her ex-boyfriend and then decides to get back together with her ex-boyfriend. So just put in the MC for Catrin.
What do Jamie and the MC tell us in EP8? That it might be difficult for the MC when his ex-girlfriend lives nearby and he meets her at parties. This is going to be a Halloween. Imagine they play the game at the Halloween party, which is what Sage, Quinn taught the MC. Does the MC recognize his blindfolded ex-girlfriend? What did Quinn say again? If the MC recognizes who kissed or licked him, he gets to make out with the girl. That's going to be fun.

Of course, I don't know if it would be as funny if Zoey later had a boyfriend at DIK and then always did a Walk of Shame. Although, I wouldn't care as long as my MC has his Josy and Maya. So no problem with that.
In EP6, the MC thinks to himself why women become friends with each other even though they're into the same guy. So in my case Josy/Maya would become friends with Zoey.
As you can see, DPC has already given us a lot of information about Zoey, about what is to come with her.
