Battle Scene with Obito
Hashirama: I hate to admit it , but i think he is stronger than me
Hiruzen: This may come off rude but i think you are right
End Scene
Now , keep in mind that Madara was a souped up version of Obito and Kaguya is a souped up version of Madara and the Sage of Six Paths admitted that she is stronger than even him
I am well aware that in the Narutoverse, there are many varibles and even though Character A is stronger than Character B which can defeat Character C , that does not mean that Character A is stronger than Character C but in this instance , i do not think it really matters