1. Mange quotes and confusion.
I'm going with Inane. In my post above, after reading my Inane version, I agree Itachi referred to the "body" not blood.

2. Bloodlines
This is what I'm saying.
Kakashi can't copy (perform them).
Kakashi can copy (learn the blueprint) and teach it.
-and the transfusion thing is my little blue hope. don't wreck it Elessar!!!

3. Mangekyou
I didn't know about the constand development and turning off thing before. But this makes sense. And it supports the theory that Kakashi can't pull off Mange. And I find myself more agreeable to this fact.
But I still maintain he knows OF, and knows HOW it's done.

4. copying Kage Bushin from Naruto
- I still think he does copy it from Naruto.
- First of all, Orochimaru was trained under the 3rd like Jiraiya was. Jiraiya and Orochimaru have not performed Kage Buushin even though it comes in handy. In fact, orochimaru prefers his "kawarimi clay" over the use of buushins altogether. I would say the lineage of education about buushin is broken at this point.
- Between 4th => Kakashi, Kage buushin was banned. And at the time up till its banishment, Kakashi didn't have his Sharingan eye to help him expedite the learning process.
kakashi is #1 perhaps. But it does not mean he knows everything. Can all S class criminals perform Kage buushin even though they're in tons of handbooks shared by all countries? No - Orochimaru is a good example.
- The scroll isn't just classified. It is forbidden. No one can see it.
- Iruka knew about it. Ok, knowing and performing are different things, let me just reiterate that.

5. 100 shadow clones w/o chakra.
Huge stamina is Naruto. He's just a chakra phr3ak. In the end it might be a product of being under Kyuubi influence - but it is not directly Kyuubi's chakra that gives Naruto his own large pool of stamina.

6. Gates from Lee
- Yes. I think he did.
- It is a last joker. Even Gai made a rule never to perform it unless "protecting someone important."
- Gai knows the gates, but his ability to perform isn't certain - although I feel he probably does know it. He didn't plan on teaching his group the gates, until they could perform the first lotus - which Lee was the only one that accomplished.
- Gai and Kakashi are rivals. Lee and Neji are rivals. Was Lee going to tell Neji about his gates and his "move to defeat" him? No. That would seem to point that Gai wouldn't tell Kakashi either.
- Gai is familiar with Kakashi's sharingan because Kakashi lost an eye, I would be familiar with my friend's new glass eye.
- Yes they show excellent teamwork, but at the same time - they are specialists at what each individually does best.
- Technician will learn what he can whenever he can. He isn't picky about who he learns from. He's slick like that.

7. Climb the mountain
- focus one's mind would just be a picture of their face .. like:
Sakura does "kai"
Sasuke does "foot concentration to catch Kunai"
Naruto does same to his feet to water walk.
- Initial lotus is a forceful way to open gate one? I didn't know that - but I'll check...
- Anyways, if it was simple concentration for Kakashi, they wouldn't even need to show his face for it, let alone a close up of his brain. He is a jounin. The opening of a gate is the only thing I can think of that would require a Jounin to focus, especially if the Jounin had just learned it a week ago.

8. Water clone
I would say in this case, the one exception, that Kakashi knew this jutsu before hand. In combo with genjutsu, he tries to pull off clairvoyance advantage on Zabuza. Tricky guy.