Board Thread:Episode Discussions/@comment-25319479-20170920093317/@comment-734582-20170924073635

Ninjachris wrote: Naruto had always had poor chakra control due to the interaction of the bijuu chakra with his own. Then why does his chakra control improve when Oro's seal is released, which allows Kurama's chakra to mix with Naruto's again? If this statement were true, it would only get worse but it didn't.

So no, Naruto's poor chakra control was solely due to Orochimaru's seal screwing up his flow of chakra.