Seeing as how he can still hit like a boss with a UCL tear, you can probably give him TJS the day the season ends, have him rehab during the offseason, and still DH pretty much to start next season, if not in the first half of 2019. Hold him off from pitching all of next year and let him DH while he rehabs the arm, then you're good to go in 2020. I don't see the problem.