Of course Kohei's greatest achievement & the most impressive ever in gymnastics is sweeping two entire quads in a row with 8 consecutive major AA titles including 2x Olympic AA gold & 6x World AA gold.
What isn't talked about as much is that he also won 2008 Olympic AA silver in his first major international competition. He is not just the only modern 2x Olympic AA champion in gymnastics, but also the only 3x Olympic AA medalist in modern gymnastics.
The only other 2x Olympic AA champions & 3x Olympic AA medalists are from pre-modern gymnastics era: Larisa Latynina (1956 gold, 1960 gold, 1964 silver) & Sawao Kato (1968 gold, 1972 gold, 1976 silver).
I consider the start of modern gymnastics around 1976 & beyond since that's when Worlds weren't held just once every 4 years & gymnasts started doing more difficult salto skills.
From the start of the modern gymnastics era, the only 2x Olympic AA medalists are Nadia Comaneci & Nikolai Andrianov (1976 gold, 1980 silver), Vitaly Scherbo (1992 gold, 1996 bronze), Lavinia Milosovici (1992 & 1996 bronze), Alexei Nemov (1996 silver, 2000 gold), Simona Amanar (1996 bronze, 2000 silver/gold), Yang Wei (2000 silver, 2008 gold), and Aliya Mustafina (2012 & 2016 bronze). So Kohei was not just the only modern Olympic AA champion able to defend his title, but also the only modern Olympic gymnast to medal in the all around at 3 Olympics.
