Originally posted by Lord Stark
Does Sidious seriously think him and Plagueis can solo the entire Jedi Council?
Not that I recall. He did, however, state that they each can take on the council's best, referring to anyone of them individually. Unless I'm remembering wrong, or Carthage is referring to something else.
As for Vitiate, I don't know why people keep harping on Vitiate's all powerful and mysterious off-screen/off-panel feats considering he doesn't display them while he's onscreen/on-panel in the middle of combat.