Re: Leading your uke?
I agree that the Ushiro attack is a pretty silly attack. I believe that I read somewhere, probably in a John Stevens book that Osensei believed that it was unsound to let someone get behind you but that Ushiro taught that one can still recover if they do. Also, to just stand there like a tree seems tactically unsound as well. I think of Randori and Ushiro similarly in that way. In that context, the attacker/s have to grab you where you want them to or at least where they are able to and not just Teeing off on where they want to and how they want to.