On a 1v1? No, and it's especially not helping that he hasn't received much improvement in his abilities, since he was sealed within the Totsuka blade and stuck in a drunken stupor genjutsu world for the majority of pt2.You didn't even read I bet.
And Orochimaru does beat itachi
W/ Edo Tensei, yes obviously. But then he or Kabuto could probably beat anyone in the Naruverse with that, bar Juubi jins.