Theory: One level 5

This theroy is an extension of the Percussionists and Judges theory. It simply added the kangaroo principal to the existing theory. The new Kangaroo principal states that a kangaroo will always be dumber than a normal person, resulting in the following levels:


 * One person with an intelligence level of five (level 5)
 * Regular Dumb people (level 4)
 * Percussionists and Kangaroos (level 3)
 * Percussionist Kangaroos and Percussionist Judges (level 2)
 * Kangaroo Percussionist Judges (level 1)
 * Even dumber people with no intelligence and no reason for existing (level 0)

Disproof
This theory was disproved by the existence of Xqc13 and Farxodor simultaneously, both of who can understand intelligence levels, and therefore have an Intelligence level of five. As the One level 5 theory states that only one person has an intelligence level of five. This theory has also since been suspended due to the discovery of Simons.