Re: Aiki Ken and Ken justu
I can't speak for anyone else, and I certainly have no real sword fighting experience, and I suspect that none of the previous posters nor any koryu people alive today have any either.
I train in Iwama weapons. Several years ago, after about five years of training I tried tameshigiri and had no problems making cuts or handling a katana. I found that the skills translated easily.
I also have a good friend who only had experience with Iwama weapons, and used a jo in Dog Brothers stick fighting (for those that don't know, this is full contact, no joke) with success. He felt many of the jo forms fit naturally.
We were both serious students of a very good teacher, but my point is many people commenting on the difference of various styles or systems have no grounding for their opinions.