Re: Selfish people in the dojo
In my dojo, and in those I learned my aiki, the highest-ranking student is placed witht he lowest-ranked beginner, then the next highest witht he next lowest, and so on until everyone's paired up. We stay that way for about 20-30 minutes, depending on whoever is teaching/leading the class's mood, or mode, and then it is switched up and staggered about.
But, the highest with lowest is nearly always how we start out. Otherwise, if you are always practicing with people "who know what they are supposed to do," you run the risk of entering a self-referencing loop which is never challenged/questioned with outside stimuli.