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In this panel Sasuke says that he learned the truth about Itachi from Tobi and Danzo. IF you remember Danzo's flashbacks him and Hiruzen we're best friends/rivals. Earlier in the flashback you see Danzo, Hiruzen, and Tobirama all together. So Tobirama definitely knew Danzo. Now when Sasuke mentioned him, shouldn't Hiruzen or Tobirama said something? Like: "Why would Danzo reveal top secret info to you?". I know this is a very minor complaint but you'd think that Hiruzen would want to know what Danzo is up to.
How they could have fixed it (2 panels)
*after Sasuke mentions him*
Hiruzen- "Danzo? why would Danzo tell you such a secret?!"
Sasuke- "I made him tell me right before i killed him"
Hiruzen-