I agree with you, from what we've seen I'd say hashi would would use heru as an ass wipe....but.....we haven't seen hiru in his prime and we havent seen hashi in full action, and we havent seen what really went down between hashi and madara, how he beat him if he really did beat him could make a difference in our opinion.....all I'm trying to do is protect kishis reputation as an author, he wrote hiru is the strongest and so I'm just providing evidence as to how that could be possible.
You see no author would want people to think he has contradictions in his work so that's all I'm trying to do, explain that he doesn't.