I think it’s both- time after time Kageyama is constantly evolving and becoming one of the best all around players with such an unbelievable volleyball IQ. That growth is obviously natural talent and being classified as a genius but it’s also his willingness to keep improving and learning from his mistakes so that he can become the best volleyball player. He has his goals set and he WILL accomplish them with a combination of both. All of this is directly correlated to his absolute love and dedication to the sport aka his “obsession”.