FWIW, those 96-97 have come on one pitch, the last one on the third SO, bases loaded, had to get the hitter out on a SO, so the intent had to be there to throw hard, but he didn't know it until later and he was surprised by it. Dennis' mantra for DK is reach back, when you have to, other than that live in your comfort zone on your FB and stay consistant, work the corners, stay low in the zone and when you have to, get them to chase a high FB, your philososphy should always be one pitch, one out, use your sinker, slider and let your defense do their job . Of course on some days the comfort zone is greater and on some days it's lessor. If son's FB isn't cooperating he finds trouble.
That may not apply to every pitcher, but that seems to work for him.