But don't you see? Sasuke was born with an ultra-hyper SPESHUL Uchiha body, with the genes for no zits, smooth hair, eyes that sparkle and bleed a little sometimes, a perfectly sized penis (not so large it causes discomfort but just large enough to fel good) and perfect abs from the very day he was born. With that heavenly designed body how could he NOT have any trouble moving just like some weirdo with huge eyebrows who just so happened to have, pssh, trained like some kind of idiot. Lee wasn't born sparkly, hence those who were born sparkly can copy him easy-peasy.

Or, in other words: your rage. I feel it. I oh so feel it.