I agree with, Marc...in the meantime perhaps you could seek him out and practice diligently with him. If there comes a time for you to correct him perhaps you could call your teacher over and ask a question from your point of view. Then it would not be just you and him.
I like to pay attention to how I feel about each partner on each day because I can learn a lot about myself that way. If I got to partner with a perfect uke or nage all the time so many opportunities to meet myself would be lost.
The problem with practicing with this guy is its honestly almost every technique he needs correction on. He doesn't understand the basic ways to move in Aikido. He flows nice but no idea on how to move the body correctly. There is no balance break on any technique he does on me. I would have to have Sensei over the whole time to watch this guy. I have learned a lot from practicing with this guy ...on how not to move correctly or how not to break balance. Practicing with this guy seems one sided. He wont let me throw him (he falls before the throw is done) or finish locks (taps before ANY pressure is applied) and yet will CRANK the crap out of my arm with a lot of strength( I can take a lot of pain but it does seem over excessive).