They may have been equal 20 years ago but now its a diffrent story...and heres the proof. 1. Tsunade stopped training for 20 yrs(this is also the proof that sakura will definately surpass her) 2. Jiraiya has been busy gather data for his books. 3. Orochimaru stays young and has continually been developing new jutsu's. in conclusion they are the strongest in this order Oro, Jiraiya, and then Tsunade. They were at one point equal in strength and power though. this excludes the summons.