I noticed a very similar thing today too. I went riding with my brother today, he has been "learning" from some folks he met at school. They have his upper body leaned way over while his ass doesn't move at all, he sort of bends over the top of his bike. Now I also know that my leaning position sucks, I slide my ass over to the side that I'm turning and my upper body only moves a few inches. Last time I did a track day the biggest piece of advice was to move my upper body over more (there were many more but I wont talk about them here).
My brothers body position (not actually him)
My body position (also not actually me)
