He was the son of fugitive Padawan Vad Sil-Jolk. His father gave him a small amount of Jedi training when Gadon was very young. Prior to joining the Jedi Praxeum, he barely ever used his powers, but his skill quickly blossomed at the Academy. As such, and because of the Academy's need, he was quickly given the rank of Jedi Knight.
Gadon himself thought he was given the rank too quickly, and while he was a competent Jedi for such little training, he was killed in the Battle of Celvlo IV.