I finally get it now, you snuck it under everyone's noses. You must be taking Neji Training Courses on being Sneaky Evil.
The two buffs that we get is what made us happy but those are really traps. The first one the damage modifier, is great it makes your attacks even stronger. You knew that everyone would be for gaining more power. The second one the defense modifier sounds like the first one, but its the opposite the more oro kills you get the more your defense goes down. So then you would have even harder times with forest creatures, and extremely rough times with special creatures like those two fat brothers because your defense is so low depending on your number of dragon kills. On top of that you have it to where we would run into the Anbu, and the Fat Boys often. Then you hang a carrot for everyone to see with the items that would be helpful in doing the rasengan, knowing we would go for it even more. No wonder you said we would want to go to the kekkei genkai eventually.
With all that said, I still love the idea of the missing nin. It should be mandatory that after reaching Daimyo the next rank is missing nin.