you nerfed the sage's body too much (this is inexplicably stupid)... you underestimated him too much. the increase in strength had to be colossal (a person with the level of chunin chakra cannot have such a body... this is not a bloodline, but the result of work and talent... there cannot be such an insignificant increase. I would understand if it was a system of templates and he unlocked only 0..5 - 5%... but he got the full body of the sage...)