Board Thread:Versus Debates/@comment-2245550-20160522071949/@comment-9782468-20160523045746

... But he did. Why do you think he trained so hard that month? So he'd have the physical capabilities to actually use the Taijutsu he saw from Lee.

It's not a copier. It's an eye that takes in a vast amount of details. You can copy using the details, but the Sharingan itself is not a copier. Which is why Kakashi was famed for being a Copy Ninja, not the entirety of Uchiha being famed as being the Copy Clan.