For the following reasons:
Experience.
Lack Of Feats Illustrated.
Experience.
Lack Of Feats Illustrated.
Side note: Sakura was described as the worlds strongest medic in The Last but I take that as Tsunade retiring from practicing medicine due to Sakura's ability to carry her torch and potential to further progress her teachings/techniques. I'm not saying that the possibility isn't there of her already surpassing Tsunade as a shinobi but I would've rathered Kishi produce actual creditable feats that could be compared to things like Lee's surgery.
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