Supra Vijai
Black Belt
Absolutely. But it's not necessarily just between the teacher and students - you build up a sense of trust and closeness to any of your partners since you are literally putting your health on the line playing uke for each other, trusting in them to be sensitive and in control enough to back off right when you reach the edge between pain and injury. For this reason, you'll usually never see beginners paired up with each other - they're placed with a senior student instead.
See I thought (and not discounting what you said at all) that it was because the senior students were epected to have base mechanics of the art right already. When I partner up with someone of equal rank the attacking intensity is at one level, when with a senior it's different and when with a new student it's another again. I saw that as the ability of the Uke to throw the correct punch or attack with the appropriate mindset of the technique. Things like a straight punch with a vertical fist from someone who is more experienced is usally actually straight and to target whereas with a beginner it can be thrown as a cross and the targetting may be off. By partnering the new guys with seniors you allow to a degree a learning and teaching system whereby the juniors can learn from their more experienced partners who are learning the more intricate details of the tech, thereby allowing the Sensei to offer advice and refine techs for the seniors.
Just my take on it, please correct me if I'm wrong