Sweet,
The only picture that I currently have (on computer) available right now is this tanto. Imagine much longer. ha ha Haven't much around to show off right now.(Sorry) I will have some more pics of a new katana however very soon and will put my new digital camera to use next week for you if you would like and show pics? The tanto in picture was made via stock removal and the fittings were done by a friend. I now forge my Japanese stuff. I only do the steel work though, no fittings. I also only do Japanese stuff.
Triton,
First off, I must apologize if I vented there. Didn't mean to. Anyhow, that would be a Dai-Katana in your pics. That I cannot and would not even attempt to forge.

I own The Seven Samurai and feel pretty safe to say that the sword in question would fall into nodachi category. The sword in your picture could be called a nodachi, but I wouldn't.
There still is some gray area on tachi compared to nodachi. Still, nodachi were seen under 4 shaku. Some were bigger, even six feet overall like you said. Some say there is a grey area vs daikatana and a nodachi as well. That is arguable. Daikatana were just damn huge. DAMN huge. THOSE did become an obsolete weapon on the battlefield early on. Sure would like to see one used though! At times there is also gray area between the lengths of tachi and katana. Especially, comparing then and now.
As far as the alternate pronounciation of Kojiro, that I do not know. Gan-Ryu however, is an actual ryu-ha nonetheless. Whether it is still being taught, I am unsure. I think it is. Don't quote me on that though. Yes, Ganryu was also the island. But, it is also a sword style. Relationship? I'm sure. How? You got me.
It was held at the ready when battle was joined though, not drawn from the back.
WORN Triton, worn.

I did not say they drew it from that position. Just a place to put it. But... that is talking about nodachi. Take it off your back, then draw it. Kojiro tossed the scabbard to the side actually. Guess that is all you could do really. I believe also, daikatana users had servants carry their sword until it was needed. It was true of jin-dachi at least.
It is at least refreshing to talk good talks about lesser known weapons. Thanks Till!
I'll get off your toes now Triton.
-Jason
Sorry, crappy pic.
Sweet, go here instead...
http://www.bladeforums.com/forums/showthread.php?s=&threadid=194144&highlight=Aikuchi