Board Thread:Consensus Track/@comment-27251696-20151128062325/@comment-9782468-20151128073542

Stuff like this goes in theories and speculation, I moved it. Welcome to Narutopedia!

As far as your question goes, he can comprehend and grasp everything, but he's not omniscient because he can't do anything he imagines. He can't turn Sasuke into a duck, he can't awaken a Sharingan, he can't turn back time. Omniscient means you're able to do literally anything. Naruto is very powerful, but not close to omniscient.

I personally believe that he can use any nature release he wants to. But some users disagree.