Re: Why no tsuba?
We learned a new sword kata last night. And in one variation, one partner responds to an attempted block by sliding along his attacker's sword until they lock tsubas, then using the resulting closeness to grab the attacker's outside (right) hand. I don't claim to have vast sword experience, but moves like this are not unusual in the sword work that I've seen.
But I'm probably shouting down a well, here, since it's already clear that the anti-tsuba forces don't consider the behavior of actual swords relevant to their practice.