It's that combined with pitching over 100 innings more than any of the previous 3 seasons, combined with his struggles against Milwaukee this year (albeit obvious SSS), combined with his struggles in September.
That said I've talked myself into Boyd going 3-4, Rea going 2-3, and the pen the rest of the way and the fact that Boyd would be able to pitch game 4 on normal rest if needed and game 5 on extra rest.
Shota game 2, Taillon Game 3, Boyd Game 4, all hands on deck Game 5