Answers to Itachi vs. Gai nonsense:

#1 Taijitsu is strong against a sharingan user

The sharingan's weakness to taijitsu is being vastly overblown. Let's look at what the sharingan can do:

1) see through taijitsu, ninjitsu, and genjitsu
2) copy taijitsu, ninjitsu, and genjitsu
3) play mind games with the opponent

The sharingan still gives an advantage to it's user on all three points. It helps see the enemy's movements
better, can still copy taijitsu techniques (even if it requires the user to already have the speed to perform
them), and (since the user has likely used it to copy ninjitsu before) provides the user with a wide range of
ninjitsu and genjitsu to use. Furthermore, it requires the taijitsu user to not look into the sharingan user's
eyes, which would make it more difficult for them to fight.

#2 Gai is faster than Kakashi

It's only put Gai ahead by 1 match out of 99, sohow much of an advantage is this going to give him against
Itachi? If anything, it says that Gai has to be faster than a sharingan user just to fight evenly. And Itachi is
faster than Kakashi as well. Much faster.

#3 Itachi left when Gai showed up

Itachi works for a secretive organization pursuing some secret goal. Fighting a huge battle with half of the
ninja in the village isn't the best way to keep a low profile. Remember, Gai said that ANBU were coming
as well.

#4 The Lee vs. Sasuke fight shows what Itachi vs. Gai would be like

Sasuke was just plain weaker than Lee at the time. Just one month afterward, though, Sasuke had caught up
in terms of speed.

Point is, we know that Gai is on the same level as Kakashi, who is far weaker than Itachi. Sasuke on the other
hand, was not at the same level as Lee. Lee had been a Gennin about a year longer than Sasuke). There's
no reason to think that the relative difference between Itachi and Gai is the same as that between Sasuke
and Lee, so using the Lee vs. Sasuke fight as a point of reference is absurd.

#5 But Gai can open up all 8 gates. That would give him enough power to beat Itachi.

Lee was faster than Garaa to begin with, and he still couldn't win even with 4 gates open. Eight gates would
be a larger improvement, but whereas Lee had an advantage, Gai would be coming from a disadvantage.

More importantly, primary loutus takes time to power up, and it's kind of obvious when you're doing it. The
effect also doesn't last for long, and you're finished when it's over. This means that one genjitsu from Itachi
(remember, Itachi's genjitsu counter was good enough to fool Kurenai, who is likely much more proficient
with genjitsu than Gai) could stall Gai long enough for the effect to wear off and for him to be finished. Or
Itachi could create shadow clones and hide among them. Or he could use any other of the hundreds of
techniques that he probably knows to buy 30 seconds of time. After that, Gai's finished.