So he wasn't made an effective proxy commander of the fourth division and didn't help to combat two of the biggest problems on their battlefront, kinkaku and ginkaku, and Asuma nor figured out that obito was goin to use the nine tails chakra from kinkaku and gingaku for the Gedos statue. That must also mean that he didn't create an effective way to keep everyone safe from any zetsu clones by drawing circles around everyone and staying in them til naruto came to help.
Do you believe Kakashi, Sasori, etc. couldn't deduce as much?
Now when the tentails came along, he wasn't the one to figure out that using bug jamming and hidden mist jutsu would keep the alliance hidden
That's what those two jutsu are designed to do, so I doubt he was the only one to figure out their use.
Now you try to change the point by bringing up all of itachis other skills when this discussion is strictly about intelligence only?
Intelligence is the substance used to attain a variety of skills.
Now I can tell you're desperate, pulling at straws to make sure that you're precious Itachi doesn't lose any face. (And since when does Itachi have any medical jutsu or sealing expertise? We don't know if he made the medicine that kept him alive, which is by the way HIGHLY unlikely
Aside from
most likely creating his medicine, as his sickness was a closely guarded secret... Itachi transplanted Shisui's eye into a crow, and not only altered its system so it could sustain a Sharingan (something part on Kakashi couldn't do) but also permitted it to fire Mangekyō jutsu. Moreover, the sealing and triggering of Mangekyō traps in host vessels is a unique sealing invention that even Obito, with all of his vast knowledge inherited from Madara, didn't understand how it was accompished.
considering how much time it takes to be a medic nin
It took Sakura three years. Considering how untalented she is in comparison to Itachi, it's perfectly plausible.
You can also prove that Itachi could easily figure out this jutsu? How so? Hidan's Immortality and his ritual jutsu isn't exactly something that can be seen with the sharingan.(Another fine point on how Itachi relies on his sharingan while shikamaru only uses his brain.)
Itachi doesn't rely on his Sharingan, as he was considered the greatest genius the academy had ever seen
before awakening his Sharingan. He graduated at age seven, and was said to never have to even be taught, but awoke his Sharingan at age eight. So right there, we know he excelled more than Shikaku at a young age. IQ being intelligence quotient. That is, the quotient of intelligence and age. Hence Itachi's IQ is superior to the Naras.
Okay, seriously? KAKASHI figured out Kamui, not Itachi.
This is a little know point, but the movie Kishimoto recently wrote had Itachi deduce Kamui much more quickly than any other ninja beforehand, and caused Obito to back off immediately. And since it was written by Kishimoto, it's a valid representation of his expectations of Itachi's deductive ability, which he already had Kabuto commentate on being nigh supernatural.
Kakashi also figured out rinnegan shared vision and rinnegan jutsu and if he could do it, then shikamaru, who was also considered to be on and higher kakashis intelligence level could do it too.
First, Shikamaru was considered Kakahsi's equal by Naruto, not his superior. Secondly, it took Kakashi much longer than it took Itachi to deduce and counter Rinnegan shared vision.
Itachi had to extract the infromation on how to stop Edo tensei from kabuto himself with a hypnosis jutsu.
Itachi intuitively deduced two different methods to counter Edo Tensei. The first was controlling him with genjutsu, which Obito had to ask Kabuto. However, Kabuto closed his eyes to prevent this method. So Itachi had a second method, which was using Izanami and then extracting the information with a mind-reading technique. These were solutions that neither Obito nor Hiruzen had deduced. The latter assumed Edo Tensei was un-counterable, and the former had to ask Kabuto.
Lets see now, without his sharingan, how would fare in a shurikenjutsu battle with tenten or a genjutsu battle with Kurenai? He would FAIL miserably. His sharingan is what grants him these abilities not his regular skills.
Not true. He practiced throwing shuriken with his eyes closed, and he curved the kunai into Rinnegan blindspots, etc. These are technical feats that have nothing to do with the Sharingan, nor does his
vastly superior hand-moving (throwing) speed that Tenten has no chance against. Similarly, Shikaku said that Itachi was the only genjutsu user to take control of ninja from long range to affect a war, so again, that has nothing to do with the Sharingan and yet places Itachi on a much higher level than anything Kurenai has been implied to be capable of doing with genjutsu.
Shikamaru has an IQ over 200. If Itachi had anything even remotely close to that, then it would have been mentioned in the manga somewhere.
It was when Itachi was said to be the greatest genius the academy ever saw.
It was when Itachi was said to never had to be taught.
It was when Itachi was considered the greatest genius among a clan of geniuses.
It was when Itachi was stated to have Hiruzen's reasoning ability by age seven.
It was when Itachi was stated to be the only one to perceive Obito's presence in Konoha.
It was when Itachi was stated to ceaselessly amaze Obito.
It was when Itachi was such an advanced learner that he humbled a Sannin at age 11.
It was when Itachi located legendary items that Orochimaru/Madara could not find.
It was when Itachi was stated to possess perception surpassing all dōjutsu users.
It was when Itachi has outlier accomplishments/inventions in every ninja art.
Let's compare that to the hollow bragging about IQ scores, shall we?