What's to say any pitcher we spend big money on will not become injured also? Last year Keuchel, Kershaw, Price, Milone, Wheeler, Harvey, Felix, and the entire Seattle pitching staff spent significant time on the DL.
I'm sure that those injured pitchers were just a sample of all the injuries to pitchers last season. At least our in house 8 pitchers are healthy at the moment and are still under team control.
Our offense on the other hand was atrocious last year, and even with the Upton addition we still have more holes in the IF than Bonnie and Clyde's last car.