Re: Respect/Lack there of.
The one thing that disturbs me about this post is that it appears that the dojo-cho was never notified of the guest's desire to attend class. If that had happened, perhaps it would have solved the dojo-cho's need to ask the nidan to teach the class in the first place.
It also might be good to look at things from the nidan's perspective. Having been asked by the dojo-cho to lead the class, he's now put in an awkward position. Perhaps he really had something he wanted to teach that night. Perhaps he relished the opportunity to test his teaching skills. Who knows? Ask him. After all, wouldn't that be modeling the respect that you hope to receive?