Laird - do you have a way of posting a clip of what you're talking about? I think I get it - do you hit with your fingertips or your palmheel when you train this bunkai? I'm keeping my fingertips for typing - so while I can hit pull power with my bushiken - I usually insert palmheels for fingertips. Or if you condition your hiraken I guess you could use that too - but you don't have the option of a quick grab.
Stryke - what you describe is one of the moves that is a favorite at the K1 and sanshou tournaments. Only difficultly is not helping them fall lightly


OK - on to series 5 - the forward lunging elbow.
This is something you can do "joust style" if you time it right. Just line up your body, go straight down the tubes and plant your elbow into the oncoming puncher/shover. The raised Hiraken fist protects you against their head if it flops forward. (Another reason to train and condition those traditional fists!). And if you happen to stomp your front foot on one of theirs their fall will break the ankle or at least wrench it a good bit.
The reason I don't connect this technique with the next two (bushiken & knukite) is that if you execute the elbow properly - they're not standing their for you to continue to hit. And in Sanseiryu the following move shown makes sure that uke won't get back up..
Simple. Brutal. The most important part (IMHO) is that your structure is all lined up before you put weight on the end of your elbow.
Now - there's another take on this technique altogether as shown by Toyama's tradition (among others). This makes the elbow into a plunging technique. Where the tip of the elbow is placed on uke and then you're sort of doing a drop-in-place so that your body weight transfers in and down through your elbow into uke. I've had a tougher time making this one work - although admittedly I haven't spent all that much time on it yet.