His value is tied to his health and amount of innings he’s pitched, much like Mark Buehrle.
Gotta stop quoting cumulative WAR totals, he’s not better than a lot of the pitchers below him on that list that have only been around for a couple seasons (Bieber, Burnes) or guys that have had injuries (Strasburg, Severino, Paxton, Syndergaard, Flaherty, etc)