Board Thread:Versus Debates/@comment-30830650-20170116074632/@comment-9782468-20170119173431

Namikazenaruto9 wrote: But isn't Jiraiya starting fresh? I mean from the start jiraiya is gonna have complete stamina. And the Senjutsu he loses is replaced by the nature energy gathered. It's continuous process where the Jiraiya's chakra reserve gets filled the moment it empties(because of use of jutsu) and the risk would be their if only he starts fight at low stamina. PS: Ma and Pa aren't the only ones if both of them are attacking Jiraiya has to gather nature energy or else he will stop being in SM. Nature Energy by itself isn't usable as Sage chakra. Ma and Pa can gather a Nature Energy, and Jiraiya can keep mixing it with his own to create Sage chakra for Sage mode. There's probably an almost unlimited amount of Nature Energy, but Jiraiya's regular reserves, which he needs to create Sage chakra, is finite.

To put it into quantifiable terms, lets say to make i unit of Sage chakra, you need 5 units of chakra and 5 units of Nature Energy. Ma and Pa can supply as much Nature Energy as he wants, but if Jiraiya has say, 25 units of chakra, he can only make 5 units of Sage chakra. This is because he needs to use up his own chakra to balance with the Nature Energy to activate Sage Mode. Once his own chakra runs out, Nature Energy will petrify him and not help him.