In BTB, there are teammates whose names are green, but it is unclear as to why they are, and the game doesn’t not communicate to me as a player a clear reason why they are different. If I am in a party with another player or players, it appears guaranteed that they will fill the roster of up to four green highlighted teammates, however, if I am in a party with only one other teammates, I am getting visually clutter that prevents me from being able to quickly identify and play alongside my actual party member.
I strongly recommend that the green names only apply to teammates who are within your party, to give it a consistent implicit meaning