Madara and Obito could control Kurama with their Sharingans. My question is how exactly did they do it? What is required to control this beast? Is the Sharingan enough to do that? Can they control any other beast with the same technique?
I remember Kurama once said Madara's chakra could summon it, but how was Obito able to summon and control it on his very first attempt? There's no way he could've practiced it because it was sealed inside Jinchuriki since Madara's defeat against Hashirama.
So how exactly were Madara and Obito able to control Kurama?