Wasn't King Danjong actually a king with a very solid legitimacy and justification?

Jeongjong = Just a figurehead for a short time
Taejong = Coup d'état
Pushed his father aside and killed his half-brother
Sejong = Became the Crown Prince as the third son because his eldest brother was a rogue
Inherited the throne immediately after becoming Crown Prince
Sejong's son, Munjong, was the legitimate eldest son
Furthermore, since Danjong was born while Sejong was still alive
Great-grandson of the King - Royal Grandson - Crown Prince - King
If you think about it carefully, wasn't his path to the throne absolutely legendary? ㄷㄷ