Just took a closer look at my guy Cook. Over the 5 previous seasons, he missed 47 weeks during the season. That came from 3+ injuries per season, on average, and about 2.5 trips to the DL per year. (Excluding day-to-day injuries, of which there have been several.) Then last season I went out of my way to not start him almost 60 times and he suffered no injuries, for the first time in his career. That just doesn't feel like luck, though I know it well could be.
Of course, the effect is almost the same, whether he sits 60 games resting or with an injury.
Note though that when he didn't start he managed to come off the bench about 40 times. He couldn't do that if injured.