to be injured he wouldn't pitch. That would help his WAR. Then he could play the field. But no, him pitching is so valuable, but it comes at a risk. For every other player injuries affect their WAR. They don't play, they don't accumulate WAR. Should we not use WAR for them because it is unfair they missed a month of the season? No! What happened to "the best ability is availability."
Take Judge last year. Should we deem him the best player in baseball because he got injured at Dodger Stadium? His injury was part of his season.