To confirm Kaat's standing, I delved deeper and computed Career Pitching Runs for the nine most recent pitchers elected to the Hall of Fame (Blyleven made ten).
Again, Kaat's numbers simply don't stack up. Bruce Sutter's number (117) is less than Kaat's (137), but that's to be expected as he was a reliever/closer.
To conclude my study, I compared Kaat's numbers to a few other pitchers that are in the conversation regarding the Hall of Fame.
For starters, it proves Kaat was a better pitcher statistically than Jack Morris. Kaat had a better ERA+ (108 vs. 105) and a better Career Pitching Runs number (138 vs. 83). Looking at JAWS, Kaat ranks ahead of Morris but behind both Luis Tiant and Tommy John.
Logically, if Morris gains entry so should Kaat, Tiant, and John.