well, it may have been made canon by the manga, there's a definite encouragement of it in the game. There's a lot of extra scenes and such that Hugo gets as flame champion. Geddoe gets many of them as well, while Chris doesn't get all that much all. To me at least, Hugo was always meant to be the default Flame Champion, whilst Geddoe and Chris were there to provide the player with some diversity. Hugo also has the most to lose in Suikoden 3 of the three of them. Although Chris and Geddoe cared about the conflict, neither of them would really have been effected have as much by not getting involved.