Board Thread:Theories and Speculation/@comment-27717552-20160513151229/@comment-25093611-20160518152242

Thekillman wrote: Jiraiya at least has significant enough reserves to do it, since he can do sage mode. i dont mean that it wouldnt be usable by him but that it would be to taxing in order to makeit a jutsu often spammed, unlike naruto he doesnt have near infinite amounts of chakra to give :I

and as you said, jirayas fighting style is not suited for such flashy and totally un-ninja-like jutsus like nature-rasengans :)