Until I see Sakura break Susano'o she hasn't surpassed Tsunade. Merely punching a clone backward isn't going to cut it, Naruto could do the same thing in SM, KM, or BM.
I don't really feel Sakura has surpassed Tsunade. Tsunade's strength is fairly similar to what Sakura showcased in the last chapter, and she still has superior Chakra reserves, and Katsuyu on her side.
Not be a hater but I will confirm Sakura > Tsunade when the '3 year' thing is clarified..... Tsunade seem to take much much less time to gather chakra for the Seal.
Also I will confirm Orochimaru > Sasuke..... when Orochimaru actually dies or u actually manage to discover Orochi's full arsenal.
Kishimoto makes Sakura go ham on a plethora of Juubi clones; and you believe she surpassed Tsunade all of a sudden? NO FREAKING WAY! She needs Sage Mode and Katsuyu to really surpass her mentor.