Board Thread:Theories and Speculation/@comment-45444155-20200806213256/@comment-6769189-20200808195628

He said of you do t have enough natural energy Sage chakra wont form. We have been over this many time on multiple threads. The energy doesnt need to be perfectly balanced to use Senjutsu.

Orochimaru's chakr is in the Curse Mark, this has been stated before in the manga