Board Thread:Versus Debates/@comment-46893705-20200915051615/@comment-9782468-20200916214745

Naruto lacked Frog features before he became a perfect Sage as well when he was training on Mount Myoboku. Just lacking frog features isn't exactly an indication to me since we already have an example of a perfect Frog Sage in Naruto. And Naruto himself had rings around his eyes with no frog features as well, but still was imperfect at the time.

In any case, while Sage Mode did help Madara react to Tobirama, Madara himself was at a higher level than pretty much everyone in the series as well. He was at peak of his life physically on top of having Hashi cells while retaining all the experience he gained well into even the Third's reign, with Sage Mode as an even bigger bonus. So just because Madara managed it doesn't mean Koji would.

Between the two I lean towards Tobirama because I'd bet on Tobirama if it were versus Jiraiya, and I haven't seen that much to definitively place Koji above him. Though if Koji were substantially stronger than Jiraiya then I could definitely see Koji winning