We know how strong Gai is, and Lee must surpass his master. Lee was holding his own pretty well against Haku, against the 7swordsmen and defeated a whole bunch of Zetsu with ease without even using gates, when Neji had difficulties and was outnumbered. Lee still has gates in his arsenal. How could Neji handle that? Do you think Lee already surpassed Neji?
After all he is a genius in hardwork himself