Re: Why no tsuba?
Two points to add, views of mine, and those with other views doesn't mean they have to be offended.
One is that from my view any swordsman in practice who cannot control his sword to the point if stopping it at the strike point is not very good. (whether 5mph or 90mph) Therefore with that amount of discipline and skill there is never the need for a tsuba. This ability to control the bokken, or sword for that matter, should be one of the primary aims before anyone tries 'fast high level sparring'
Secondly I say that the primary purpose of a tsuba is Not the protection of the hands. That's not how it came in to being and not therefore what it was for. They had gauntlets for that.