I mean just imagine if Obito Sharingan evolved into Rinnengan that be OP, Obito with kamui along with Rinnengan jutsu who can stop him.
Obito can use Kamui and combine it with the Rinnengan jutsu like ripping souls, absorb chakra, be in Kamui world while animal paths does all the work, etc. The animal path the only way to defeat Cerberus is by hitting the summoner, which is impossible since Obito can just be in Kamui world.
Obito can use Kamui and combine it with the Rinnengan jutsu like ripping souls, absorb chakra, be in Kamui world while animal paths does all the work, etc. The animal path the only way to defeat Cerberus is by hitting the summoner, which is impossible since Obito can just be in Kamui world.