Yes, because we're talking about following a team here. If we were to focus only on Elena, for example, we would miss side stories that I think are important for the group's development. Of course, Elena is the most central member since she’s the captain and makes a lot of decisions, often manipulating people. But she's not the only one capable of or interested in doing so.
I envision this game with a more realistic approach: each person may choose their own path and influence one another at some point (with limitations of course). No one individual can decide everything for everyone, and I think that makes it more interesting. For example, at some point, I want a path where Zak manipulates some cheerleaders and others without Christelle's knowledge (man, that won’t end well!). And I don't necessarily want Elena to be directly involved in that.