Haha I was just about to answer your question on How Naruto would learn the Jutsu. Tsunade obviously has the formula, but to those saying it doesn't take a lot of Chakra or whatever, think about it...Tsunade has the formula for FTG so thats how the Genma squad transfered the Mizukage to her, but Chapelle is right they are definitely saving FTG for Naruto, Minato put the kyuubi in Naruto to counter Tobi because he felt the Shinobi world would need it. There is definitely only certain people who can learn this tech because if everyone could why wouldn't Tsunade just be like okay everyone here is the formula put it on your Kunai and kill everyone, and who would be the perfect person to try and master/learn FTG than Minato's son, just like he learned Rasengan and mastered it to Rasenshuriken by putting his own Chakra into it which Kakashi and Jirayai have both said Minato wanted to originally do but he didn't live long enough. Also, FTG works against Tobi, but someone said that it was the only thing that hurt him and I am pretty sure that was Level 2 FTG:
You must be registered for see links
My guess is that "that jutsu" is FTG Version 3.... What is ver 3 is anyones guess.. It would obviously require tremondous amount of chakra, thats why Minato left it for his son to complete FTG's 3rd and final version.
We know Minato showed us version 1 and 2 of FTG...
It is the only thing that can beat sharingan.. instant "Flash" speed.. especially tobi.
In normal cases I don't think I wouldn't agree with you, but I do think there exists a FTG Level 3, look at the link I posted in my Quote and what I wrote. Minato created Rasengan...never finished it because to him Rasengan being "finished" meant adding one's own elemental chakra...Naruto Masters it with Wind Release : Rasenshuriken and especially the fact that he can throw it now.
Minato definitely never finished FTG and as we are coming to see obviously secrets are passed down from Kage to Kage or Hokage to Hokage, I bet we will see a flashback in which Sarutobi gives the jutsu formula to Jirayai who then gives it Tsunade before Jirayai leaves and gets killed by Pain/Nagato, or some linear thing like that.
FTG is not only the only thing that can beat sharingan, Itachi (Who I honestly think was in the top 2 when it came to Sharingan use) praised Gai for his skills and his own way he made up to counter the Sharingan. (I think it was by looking at the Sharingan user's feet and following their movements based on that). Sasuke's MS was not able to keep up with A's Lightning Release Armor which is why he needed to cover himself in Ameratsu flames and still got sent flying with a Lateral Bolt of Pain or whatever A's wrestling tech was called. Immense speed in general is the only thing able to counter the Sharingan very well. As for going back to what Chapelle said, I kind of now feel like when she said FTG would be saved for
HIM, I think she wants to use it for Tobi to counter his S/T Ninjutsu since it is the only thing we have seen thus far that allows someone to escape it. At first I did agree with you and I still kind of do that Naruto is definitely going to learn FTG and master it but I don't know if the
HIM was for Naruto b/c I feel like she would have just said Naruto because usually when Kishi writes
HIM it usually sends us all into a frenzy.
EDIT: Also, just how Sarutobi learned Dead Demon Consuming Seal from Minato, I feel like Tsunade knows it as well. I also feel that Tsunade is going to use this on Madara, ruining the plan. Think about it...DDCS does work against Edo-Tensei/IWR Characters as shown by Sarutobi when he seals Hashirama and Tobirama and now they can't be resurrected. Tsunade probably knows she is going to have to do this if things become desperate, and Madara wouldn't know what the technique is because he obviously wasn't alive, unless you believe Madara<>Tobi. But this is just a theory and a statement.