So when both LeBron and Harden sat, the Rockets were -6. Am I right? (And it's only 1 minute.) LeBron and Harden both played 40 minutes. If LeBron played 7 minutes without Harden, Harden also played 7 minutes without LeBron. Do you have the +/- for that?
He went to the locker room, the players might have known it was for maintenance, but if not, that can take a team out of the game for a while. Not knowing if their star player is done or not.
the final score. See my OP disclaimer. I don't like +/-, but for large minute stars, we are just talking about 8 minutes without Harden on the floor. So, his +23 minus +5 final score = what the rest of the team did without him.