Otherwise, though... I do agree that it would have been awesome to the most ridiculous degree if that had been possible (in bold to deal with flamers who selectively read). Kind of like how Kakashi was a ninjutsu badass before the Sharigan, Lee is a taijutsu badass before the Byakugan. Although just like how Kakashi was able to fully handle the Sharigan and his body isn't meant for it, Lee would have had plenty of issues with the Byakugan. Including but not limited to the fact that there is a whole set of techniques that go with it and the fact that he has poor chakra control so he wouldn't be able to focus it or maybe even turn it on.