In the Gon vs Pitou fight, Gon won the fight, but Pitou won the battle.
It's an interesting case of the apparent winner being the loser, and the other way around.
It's no longer a grey area, it's a direct black and white swap, where Gon Sacrificed everything, his life and powers just to kill for the sake of killing, while Pitou fought to defend. In the end, Gon lost all his powers, and got his life reduced, Gon won nothing. Not only didn't he win anything, he lost everything.