The reason for deciding whether the MC goes along for Sage, Maya, or both is simple. It underpins the friendship.
The MC has to be there for the conversation because he will learn things that the MC (meaning us players) don't know yet. Don't ask me what, because I don't know either. I can only make assumptions.
Conjectures:
Josy is afraid of losing Maya and the MC. She talks to the MC at the end of EP8 about deals that are too good to be true. Does Josy perhaps already have a deal with the Burkes and now realizes the deal is or was crap? Did Maya perhaps know about the deal or does she have a deal with the Burkes herself? Is the MC part of that deal without his knowledge?
The same goes for Sage. In the beginning, some tried to convince the MC to go after Sage. Riona and Tommy. The MC guitar ends up with Sage. After the Dorm Party, Sage suddenly has braids like KRJ at the Dorm Party. Mmmmmhhh. If you're well drunk, you might confuse Sage and KRJ. Maya didn't tell KRJ that Derek was her brother either. The confusion is bound to happen. Is Sage part of this deal without her knowledge? Which would be even worse if she knew about the deal and agreed to it.
Was the MC intentionally left in the dark? We all know how the MC reacts to lies and secrecy.