I agree with Stevie generally in the manner he describes the '40%/70%' _ He is correct.
And conditioning of the radius/ulna is a must because those bones will see engagement in a myriad of ways in the chaos of combat. But to keep in mind is that the ulna, as the smaller bone, can be easily broken even when conditioned to take hits. A fracture of the ulna bone is commonly referred to as 'a night stick fracture' _
And, yes, a gedan, perfect or not, might well save the day.
Then again, if the gedan results in a snapped ulnar in a fight for survival against a beastly opponent, the resulting loss of use of the arm in the fight, might seal our doom as we will not be able to proceed in our force continuum, such as having to reach for a weapon or other life saving tools and or engage in critical activities of the moment.
People with an ulna fracture typically experience a sudden onset of sharp, intense wrist, forearm or elbow pain at the time of injury. This causes the person to cradle the affected arm so as to protect the injury. At that point the fight is over.
Accepting and redirecting and redistributing the force is of course the way to train, but the fact remains that in doing so with a gedan against a powerful front kick, the ulnar must be in the way of that kick in the permutations, rearrangement _ of the application_ that might well result in a nasty fracture that might stop you from continuing to defend.
Then we have the possible serious complications of this fracture….. In addition to the fracture of the ulna, we may also suffer a Monteggia fracture a dislocation of the radial head within the elbow joint_ the Monteggia fracture being a variant of an ulna fracture of the forearm.
I am for better percentages in the application of Uechi techniques against habitual acts of street violence.
And here, I mostly look at our 'big three' as the mother of all Uechi techniques that work well in application.
And in our big three I don't see a gedan specifically for application against a front kick.
There is lots of receiving, redirecting of force in the moves that work well against front kicks…I have used them effectively out of instinct in tournament fighting.
A 'radius redirection' against a front kick…is much safer and more effective, in my opinion, a basic 'forearm smash' against the sides of the lower leg.
I am all for jamming the distance and shutting down the opponent's lines of force and directions. This is what I used successfully in tournament fighting.
One such example of it is how I trained my sparring class students of the 60's to deal against the deadly TSD kicks of Bobby Cheezic's fighters _
http://www.tangsoodoworld.com/whos_who_ ... heezic.htmI had them practice our seisan jump_ in reverse…
Meaning to jump forward with the left knee up and into the path of any incoming kick, front, side, back, spins, roundhouse etc.
It worked wonders in 'suppressing' and 'redirecting' while unsettling the opponent and leaving him open for a counter punch.