Charles Burmeister wrote:
This may not deal directly with your question, however, it may help to give you ideas on what you can do for yourself.
This video comes from the All Japan YOSHINKAN Enbu Taikai and is a standard tanto training drill used by honbu dojo...Hope it helps
Wrt the clips you provided, the first part where they are doing some kind of tanto kata, is this a recent creation? In my dojo, we don't do this.