Just as he created Kagebunshin, Edotensei, and other unknown techs., he created hiraishin but was unable to perfect it as Minato did using specials kunais and tags. I remember him saying, "its the fourth that's copying me" to Naruto; So I think he created Edotensei and banned it as a kinjutsu, and also created hiraishin but was unable to finish, Minato just continued from where he stopped.