People must really love Tsunade to be claiming shes above Sakura at this point..
All of team 7 has surpassed the sannin = Manga fact.
Surpass: exceed; be greater than.
Yin seal = Sakura > Tsunade
Strength = Sakura > tsunade
Speed = Sakura > tsunade
Sakura> Tsunade.

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Taijutsu = physicality. Sakura in term of physicality is already above Tsunade.
In the case you are talking about.. that'd be Sasuke or Naruto haven't surpassed Orochimaru, because they don't have the same amount of experience.. and then obviously the older ones have better taijutsu.
In a battle, they would never use Katsuyu. And also furthermore, their moveset isn't the same. Unless you want to claim Onoki and Muu also ahve the same moveset, just because they have "jinton"?