wow you are an idiot for that comment. FTG is a S/T jutsu, having nothing to do with the elemetal affinities. Also, he was a master of all jutsu taught or learnable in the village. S/T was an S rank and look up in the databooks, not narutopedia, but the hard facts written by kishi. S rank moves are typically specialized to the ninja using it. An example is rasengan, minato could use it because he (with help from J man) created it. Minato then at some point taught it to kakashi, who then ( as well as aid from J man) taught it to naruto. Im willing to bet Hiruzen didnt know it because it was more or less a private jutsu that was not taught to everyone. FTG was not taught to anyone, it was minatos and minatos alone.