But as much as I hate Madara I feel like he's the only one suited for final villain
His general presence radiates power and bloodlust
Only out shined as a villain by Orochimaru (Not comparing power, comparing overall villainous acts throughout the manga, everyone was terrified of Oro in part 1, even my man Kakashi)
The fact hagoromo talked intellectually proved he is the yin of the two brothers... a true bodhisattva (sage) is able to immediately transcend all cultures and languages and speaks in a simplistic and humble way.
In our discussion, we have concluded that Hagoromo said something entirely different to Sasuke, and that will ultimately lead to their conflict (as foretold in the prophecy that Naruto will fight a young man with powerful eyes)
It is no wonder the Rinnegan has all the heretical "Outer Path" connotations, because its owner: Hagoromo, is a heretic, the Sage is evil.