Board Thread:Theories and Speculation/@comment-45444155-20200728155230/@comment-6769189-20200730120855

Whatever Fakusaku taught him, was the method for attaining Toad Sage Mode. Maybe its the oil. Maybe its learning it at Mt. Myoboku. Idk. And honestly i dont care. The series doesnt specify why Naruto/Jiraiya/Minato/Hashirama enter Sage Mode after gathering Natural Energy and others dont.

All it tells us is that senjutsu and sage chakra dont necessitate Sage Mode.