Listen to the veteran from Engine Heat V1:
Given that there will be teams part of racing organizations, people will be promoted, demoted, killed... during the course of the game, the managers and even the whole team (logos, banners, commercials, mobile garage) minus the drivers could be ... how would you say it? ... "deleted?" "disbanded" You could say everyone who is playing has to fend for themselves so to speak. If it means leaving a team and joining another, then so be it.
So yeah, NPCing other members of a team seems key. We just have to remember who the NPC's are and not create a paradox.