okay im tired of arguing.. lets just leave it at the BEST ninja is chosen for kage as Naruto puts it in the very first episode. And being the best ninja entails of having an overall talent in all cases. So you cant be either horribly weak or horribly stupid. Its just that fighting ability would be a very important factor in a village revolving around ninjas. However, i understand also you need to be able to make decisions for a village to be succesful.