Great posts and discussion.
First, I do know a Kenpoist who went to Moo Duk Kwan TKD after getting his 1st or 2nd Black in Kenpo. He got a Black belt, then brought what he learned back into his school. It also served as his thesis, written, and form. He is now a 7th Black in Kenpo.
Combination kicks, jump kicks, jump double kicks (aka Chicken Kicks, [front, side, and rear]) are in Kicking Set #2
Other kicks not found in TKD:
- Scoops
- Knife-Edge (as vs. side thrust kick, which we also to teach)
- Vertical Heel (reference Five Swords for those that know the extension or older Tracy version where it is included)
- Thrusting Sweep
- Inverted ball kick
- Twist Kick
But the big difference is the use of legs as weapons in ways other than kicking, e.g. for buckles, checks, sweeps, etc.
Still, the power, focus, balance, of TKD kicks ... and you just plain spend so many darn hours doing them, as compared to the average Kenpoist, means that their kicks MAY look better given an equivalent time in the Art.
Bad news, it takes Kenpo guys so long to promote between belts, we usually saw TKD guys get to black in the time it took us to get to blue or green. Problematic when it is an open tournament and you have a 7 year brown belt that can ... and does win the Black division, no other training than kenpo, either.
-Michael