Review Detail of _leonid_ in Naruto: Superior Shinobi

That's simply wrong. Minato was Hokage for less than 2 years before the Kyuubi Attack, he was choosen over Orochimaru. That's when Orochimaru didn't care anymore. According to the Data Book Anko took the Chunin exam still under Orochimaru in the same year as the Kyuubi Attack when the Konoha 12 were born. It is implied during the confrontation between the Third Hokage and Orochimaru when he was fleeing, that Sarutobi took the mantle of Hokage again, The exact Timeline isn't clear but it was after the Kyuubi Attack.