I wouldn't knock the Kenpo because your boxing skill beat other Kenpoists, I would say that's a good indication of not enough practice for them.
But that moment there created doubt for you. But you could drill the Kenpo stuff and make it freestyle ready, but I guess fighting is fighting, so a roundhouse kick is a roundhouse, I just see the boxing and kick boxing as a solid base and then Kenpo a deeper level, with more options.
Example, I've never seen a kick boxer step off angle, thrusting sweep kick, step down and unwind into a right neutral bow with a left hand clear or check at least and right thrusting back knuckle to the temple or tmj. Then do that again, then the third time step off angle and thrusting right back knuckle, then tsk. Sure they have rearrangement, and basics, and the principles all exist, but Kenpo shows us how to expand from the basics.
I disagreed with the statement about goofy blocks. Thunderin Hammers or Flashing Wings uses the Left Inward Block to great effect. The Sophisticated Basics of Kenpo