Board Thread:Theories and Speculation/@comment-26388300-20150523085628/@comment-3568954-20150528131735

NejiHema wrote: I think that Orochi's expermeints are what weakened him.

And in Gaara's case, who even said that his body is weak. the databooks. which state his strength is 2.5

now thats an old databook and he may have become stronger but none the less all source material states he isn't very physically strong

NejiHema

also it doesn't matter if naruto is a Jinchuuriki he gained sage mode with out the aid of being a Jinchuuriki his chakra alone was enough to become a sage