For the record, Dave Roberts is the NL Manager of the Year in my book. The Dodgers lost 2,266 days to the IL disbursed through 29 players. That is the most in baseball. The Angels were close with 2,186 days, and the Yankees lost 2,106 days. The Braves and the Marlins lost 1,658 days and 1,584 days, respectively. Arizona lost 1,099 days to the IL. The Reds lost 1,950 days, and the Brewers lost 1,525 days. I mention those teams because the Manager of the Year discussions also involve those teams.
Essentially, Dave Roberts lost his entire starting rotation and had to balance using rookies and utility players.