There are some numbers that Jack Morris excelled at, but they are stats that are never used in HOF comparisons. (I am citing his by memory, it was stated either on Pos blog or on ESPN on Wed): Morris was the number 1 inning eater of his era, and he was 18% ahead of the #2. Its not a stat that is often appreciated by HOF writers, but GMs writing checks value it highly. If it gets you a higher salary, why isn't it part of the equation?
Jack Morris led the league in IP once in his career. Let's not confuse durability with greatness.