Here's something I've been kicking around lately, if you're interested give it a quick read.
People are constanly comparing Tobi's S/T jutsu to that of kakashi's Kamui.
First, Kamui is said to be an original dojutsu created by Kakashi with him as the only recognized user. The Kamui comes from the MS which we have not been given evidence to support Tobi knowing(though it is likely he does) And lastly Kakashi himself has compared Tobi's S/T to Minato's rather than comparing it to his own kamui technique which does not require contact with the opponent the way Tobi's technique does.
Another thing I thought of, though unlikely due to time line, is that Tobi somehow replicated and then advanced Minatos' FTG. We all know Minato was famous world wide as the yellow flash and we all know Tobi likes to watch and do his homework. The sharingan is said to allow the holder to copy an enemies actions(I thought this was only for kakashi hence the title copy ninja but whatever) then it is possible and rather likely that Tobi used his sharingan to reveal the secrets of Minato's FTG. After gathering information he could have spent any number of years between learning the secrets and the 9 tails attack to develop an enhanced FTG jutsu or could have had help(supporting the idea him and Orochimaru were together) in adapting himself with FTG.
People are constanly comparing Tobi's S/T jutsu to that of kakashi's Kamui.
First, Kamui is said to be an original dojutsu created by Kakashi with him as the only recognized user. The Kamui comes from the MS which we have not been given evidence to support Tobi knowing(though it is likely he does) And lastly Kakashi himself has compared Tobi's S/T to Minato's rather than comparing it to his own kamui technique which does not require contact with the opponent the way Tobi's technique does.
Another thing I thought of, though unlikely due to time line, is that Tobi somehow replicated and then advanced Minatos' FTG. We all know Minato was famous world wide as the yellow flash and we all know Tobi likes to watch and do his homework. The sharingan is said to allow the holder to copy an enemies actions(I thought this was only for kakashi hence the title copy ninja but whatever) then it is possible and rather likely that Tobi used his sharingan to reveal the secrets of Minato's FTG. After gathering information he could have spent any number of years between learning the secrets and the 9 tails attack to develop an enhanced FTG jutsu or could have had help(supporting the idea him and Orochimaru were together) in adapting himself with FTG.