It doesnt have to be the highest level of drama like with ana in al. It would be lame if the mc would be really damaged about zoey's depature, but it was one of his bigger life-experiences.No because she was an afterthought for 8 episode. In acting lesson, you start the Game with a Damaged MC wounded by his EX . In badik, Zoey was nothing but a brief flashback, overall, she had zero affect on MC for 8 episode.
and when the players finally had the chance to get the chosen love interest, dpc instead of continue the story give us a useless episode about an Ex-girlfriend, whos whole story during San-diego could have been and btw it was, dealt with in one conversation on the bench between MC and Zoey.
And in his talks with maya and bella early in the avn and during his talk with sage in the rain after the chad breakup it was made clear that he didnt got the closure he needed. And now we have the possibility for that and (probably) can even decide how we feel about her actions ourself (like being mad).
And i think its a great tool to show the mc's character development kinda through zoey's eyes, he grew so much since the last time they saw each other. A timid boy turned into a confident leader who isnt afraid to speak his mind or being rejected, being able to show a new level of maturity.
And she was like a tool to show us (a little bit) more of mc's earlier life, it is still kinda strange that he dont seem to have any friends before college or any other personal connections, so she helped fleshing him out a bit.