I posted the video to show basic (and I emphasise basic) xingyi-type footwork (as adapted to karate hand techniques and stances).
The one step sparring is just a static application of the footwork and karate hand techniques. If it looks like karate, that is because of the stance and hand techniques. What is different is the manner of effecting suri ashi.
The suri ashi footwork is used in other martial arts, but not with the same timing; ie. the deflection conincides with the opening step, the blow lands with the front foot of the second step and the back leg slides up a fraction of a second later to add an extra percussive moment. This contrasts with standard ayumi ashi in karate/tkd etc. This is why I referred to the video. Note also the issue I referred to Matt about using the leading foot to exert immediate force (as demonstrated, albeit for a different purpose, in this video: http://au.youtube.com/watch?v=OOwa-XcmklY).
Before you go on to say that the video shows a karate form (seiunchin), yes - but that is because it is the only video I've done relating to this purpose. And I have used the internal arts to derive an application for seiunchin.
Taisabaki is a part of any traditional martial art. I certainly didn't intend to imply otherwise (nor do I feel there is any possible implication of this in my previous posts). The particular xingyi use of "suri ashi type" moving was my issue.
If you don't see any advantage in drilling stepping then the ima - specifically xingyi - won't appeal to you. All the 5 elements are drilled as steps using "suri ashi" (a Japanese term, I know, but one commonly used so it is easy to understand). I've said before, whether or not you or anyone else feels the internal arts are effective/realistic is a separate matter from the dynamic movement.
This video was filmed yesterday as part of our morning course - not to illustrate something specifically on this forum. I don't have anything more elaborate or specifically xingyi/bagua/taiji filmed yet, nor would any such video be likely to extrapolate on what I felt was a fairly straightforward point about the difference between "internal" and "external" preferences in stepping/footwork.
I've mentioned before about hitting makiwara. I have nothing to add to my previous posts on that issue.