Trust me - number 4 is not original. Like more than a few of us "renegades" in the Uechi community, Shinjo-sensei resurrected something that was dropped from previous versions of kumite and bunkai because nobody could make it work right. We still do the original sequence in my dojo in seisan bunkai.
In the old seisan bunkai, there was a technique done after the three sanchin thrusts (to the east, south, then north. A lot of people couldn't "relate" to the technique, or make it work properly. I will explain how I do it today. How you visualize and apply the basic techniques makes all the difference in the world.
a) Attacker and defender face each other in left sanchin.
b) Attacker does sliding step and right reverse punch (a very common and natural attack). Defender performs left inside circle block. At the end of the left circle block, defender grabs the attacker's right arm, creating an instant dillemma for the attacker.
c) Attacker responds to the sense of impending doom by trying to break loose. The way he/she does this is to try to do a right foot stomp on the trunk of the grabbing defender. Defender responds by making a short, forward diagonal step to the left (getting out of the path of the front kick) and simultaneously doing an outside scoop block. Defender is now holding attacker by right arm and right leg.
The link to kata and bunkai is in the way this is done. If the defender keeps both elbows in the proper position during the execution of the techniques (the same position in front of the ribs in sanchin as you do in the kata with the three sanchin thrusts and accompanying turns), then the attacker's center is now automatically broken.
d) At this point, defender steps forward and does an infinitessimal movement forward with the right arm (like one tenth of the travel of a sanchin thrust). Attacker will automatically start falling back and to the defender's left. At the end of the step, defender rotates around and down to left, and pins the attacker's pelvic bone down on floor with right knee (after unhooking the right arm) while still holding onto the attacker's right arm with left grip. If sanchin posture is maintained, one can put the attacker down slowly like putting a baby down in a cradle. With pelvis still tucked under, defender bends forward at upper waist (like the previous move in seisan), chambers right hand, and thursts down towards attacker's right ribs.
ALTERNATIVE TO PART D:
Instead of stepping forward and rotating counterclockwise/down, step back and rotate counterclockwise. One is briefly holding the attacker like a baby while in left sanchin. Then just drop down onto the right knee and drop attacker's back right onto your left knee. Obviously you do this slowly, and only as a demo with two highly-trained individuals.
[This message has been edited by Bill Glasheen (edited 04-09-99).]