1. Having 80 oro kills to get a KG is perfect. It shows that you worked hard for it and have earned it.
2. It doesn't matter if the jutsu you pick after you kill oro shows up in your bio page or not, it does not need to be added. In the show Naruto people do not go boasting about what type of jutsu's they can use. You have to fight the person to see what jutsu type they have and figure out their moves.
3. However, having the KG show up in the bio page is different. Its like the Seven Star Tattoo or the Curse Sea, its something special that only players who have worked for them will get. People who have a KG deserve to have them shown in their bio page because it tells people "Hey, I worked hard for this and I am proud of it."
4. So all in all, I do not like this idea. But hey, thats just me.