Board Thread:Theories and Speculation/@comment-26545929-20150630030815/@comment-26084508-20150715123638

In my point of view Jiraiya is the strongest, Because he has Sage Mode. with this he take on six path of pain. and also Nagato stated that if Jiraiya find their secret sometime early or from beginning than defeating him is more hard.

Than come Orochimaru he have sage mode but not at the same scale of Jiraiya. he have a jutsu which make him immortal, he also have wood release but his chhakra pool not so large that's why he not able to use it with it's fullpower.

third Tsunade with her 100 seal technique and physical power.