So very true. I have already noticed improvements in my movement, blending (he attacks hard and fast), and technique. He is very obviously still in the muscle stage of technique- this essentially forces me to not rely on strength since he will out-strength me 100% of the time. I agree...he will stagnate if he doesn't adjust. I just have to make sure I don't play his game mentally or physically. Maybe once he realizes I have acknowledged his physical superiority by not getting into a contest of wills he will tone it down a bit.
Frankly sometimes you need to play to people's ego. If he wants to feel like he's not weak, reassure him that he isn't in the way you handle your training. He might let up on you without having to feel like he needs to prove something