Ive read through the first few pages and couldnt be bothered to read through the rest, but heres my 2 cents worth:

Gai has developed techniques to counter the Sharingan. Kakashi has a sharingan which he cant use perfectly. Gai has for all intents and purposes, a 50% win ratio against Kakashi. (If you discount comments by Kisimoto that those 50/99 wins included rock scissors and paper duels).
That essentially means, he has an equal chance of winning/losing against Kakashi.

Next point I want to establish is that Itachi is not a one trick dog.
Statement:

Orochimaru doesnt have a sharingan. Therefore, he must be at about jounin level - you know, about the level of Asuma and Kurenai.
Sound familiar? Its something similar to whats been said in this thread, namely (and I paraphrase):

If Itachi's sharingan is negated, he's really very weak.
Really, the sharingan is a vaunted bloodline ability but its not some cheat for instant invincibility. Sure its strong, but if the Sharingan alone counted for so much, all Konoha would have to do is to train up the Uchia clan to the average jounin level, and then send them out in say, groups of 5 to each major nation and take over the world. Sorry, not going to happen. The fact is, the Sharingan is an important asset to those who posses it, but its far from some magical ability that alone grants its user powers that Orichimaru fears.

The reality? From what has been revealed in the anime, Itachi is incredibly strong wether he uses his sharingan or not. Thats only a logical deduction - I find it hard to believe he could have become an ANBU commander at 13 if he was essentially a one trick dog. His fight against Kurenai, and then Kakashi should have told you that.

Final reminder: Itachi floored Kurenai, followed by Kakashi.

So, what do you get when you put the 3 points together? Lets summarise the facts:

1)Gai has a 50/50 chance of winning or losing against Kakashi.
2)Itachi is still significantly above the jounin level - yes, that means above Gai and Kakashi asl well - when he doesnt use his Sharingan.
3) Itachi has absolutely no problems dealing with Kakashi.

Conclusion: According to some, Gai can beat Itachi!
Lets get real - against someone of Kakashi's level, with specialised techniques to defeat his sharingan, Gai has a 50/50 chance. Its foolish to think that Itachi is a Kakashi with a better sharingan. Everything we've been given so far points to the fact that Itachi is far surpasses Kakashi in ALL areas. Hence, we must conclude that if gai has a 50/50 chance against someone of Kakashi's level (remember Kakashi had the sharingan! He didnt automatically lose to Gai becuase he had the sharingan and Gai tried to act against it!) and Itachi far surpasses Kakashi, Itachi would destroy Gai.

Forget about the sharingan - many of you appear to think that once the sharingan is nullified, their users are useless. Reality check! Most of the strongest characters dont HAVE a sharingan, and theyre NOT useless! Unless you have a sudden urge to say that Gai is capable of beating Orochimaru (in which case I wont bother replying) because obviously if Orochimaru had a sharingan, Gai has techniques that would nullify it making Orichimaru an average jounin, then you have one unplesant logical fallacy on your hands.

The whole point? Gai's techniques aren't some magical cheat to kill sharingan users. He avoids getting drawn into its effects by looking away, and compensates for looking away by predicting the movements of the enemy. Overall, it means that the only thing he's *gained* is the ability to fight without being drawn into the sharingans negative effects. This completely ignores the fact that its likely the sharingan user would still be able to enjoy the benifits of enhanced insight into the enemy. The bit about Gai being able to predict movement based of feet - traditionally, youre supposed to be able to predict movement based on small actions you take before doing something (And I realise im extrapolating to a great degree here) - hence we can assume that normally, experienced fighters can predict movement as well - Just not on the basis of feet alone.


Anyways, Ive written FAR too much. Good day.