Board Thread:Theories and Speculation/@comment-1872728-20160229033316/@comment-1872728-20160322092154

Thekillman wrote: The thing with learning jutsu is, you can't just easily learn them all. I'm just giving an example. Alright, so if an Uzumaki and Senju both had Six Paths Sage Mode/Rinnegan or something, learnt all the jutsus in the world with ease, the Uzumaki would still be 1 jutsu ahead of the Senju. The point is, the Senju will never be equal to the Uzumaki because they will never be able to learn that ability, the ability that sets the Uzumaki 1 jutsu higher than them. The Senju can learn other jutsus to compensate for it, but so can the Uzumaki.

Basically put: Senju can equal to Uchiha in every jutsu, but as soon as they use Susanoo, it's over. Unless you have something the Uchiha can't learn (e.g. Wood Release).