Seems like RFK shortens the bench in the 3rd if the game is close. He goes with experience. With a Dahlin-Jokiharju pairing, he can sit that pair if the game is tight and not mess up the other 2 pairs.
Chiefs have 4 games to their bye week. I've heard that his injury is a 3 week thing (optimistically). My guess is that they muscle through the 4 games with Moore and have Mahomes after the bye.