Honestly, I think the rotation will be fine, provided that Montgomery's elbow issue isn't serious. Tanaka and Severino are a terrific 1-2 punch and Sabathia continues to defy age. Sonny Gray is a definite concern, but they have viable arms waiting in the wings with Chance Adams and Justus Sheffield. I can't imagine them making a deal for a high-end starter at the deadline unless someone hits the DL for an extended period of time.