1. May I start by denouncing the stupidity of the post and its comments. The original post is the most baseless argument I have ever seen in my entire life, and you should be ashamed if that is your actual opinion. FTG is not a clan based jutsu, to say so is mere speculation. To insist that tsunade has it just because Tobirama is the first KNOWN user of it is even worse speculation.
2. Not only was the original post bad, but some of the responses were just atrocious as well. For instance, the conjecture that Minato has low chakra reserves is false, as it takes a considerable amount of chakra to summon Gamabunta, and he was able to pull it off. The conjecture that FTG takes a small or large amount of chakra are both speculation, as not enough has been seen to make a conclusion, although the only reasonable conclusion that can be made now leans more towards not that much chakra. Either that, or he has an immense chakra pool, or both. Anyways, people making speculation based conjectures just disappoints me.
3. The ABC logic responses were also dumb. Tsunade having not used it in places that she could have does not prove that she doesn't have it, no matter how ridiculous it is to assume that she does have it. Becuase I don't use a gun in a fist fight does not mean I don't have a gun. It could mean that I'm saving my bullets (conserving chakra perhaps) or that I don't want to let others know I have a gun. And this is a story. Many things are not done for the sake of plot. If it weren't for the sake of plot, Obito could have, with nagato, after taking the ninetails from kushina, captured every tailed beast a while ago and finished the eye's moon plan with no interference. Did he? No. Could he? Yes. Just because Madara didn't use all the paths of the rinnegan, and just because Tobi ha only used one path, doesn't mean that the others are unavailable to them. It's just skipping a step of logic.
4. Tobirama can definitely do FTG, I can't believe that I read that he couldn't. Well, actually, I can, but it irritates me.
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is where he uses Hiraishingiri, a variation of the Hiraishin no jutsu, otherwise known as FTG. If he can use this variation, he can use FTG, as the jutsu is just coming out of FTG directly with a katana slice.
5. Tobirama is better than Minato at FTG, with the soul reason being that he did not need to use a seal in order to use it. He simply did it, he was not confined by the location of seals. In that sense, his use is just like Kamui's, except without the ability to locate where anyone is, which is what makes his space time ninjutsu inferior. Thus, with the same ability minus the restriction that Minato has, we can say that Tobirama's is better.
kthxbai