Who is the naturally born strongest character in Naruto? No jinchuriki, sage of six paths power ups or cells from other people. Just the stuff you are born with/ can naturally develop.
A raging 8 tails which he fought to a stalemate. A rampaging tailed beast is weaker than a perfect jinchuriki as they can't use their power properly. 4th Raikage was stronger than a perfect jinchuriki Bee back in the day and Minato was stronger than him making all of them stronger than the third Raikage