So. We have DE Luke (who is extremely powerful as it is), combined with the Force attunement (not actual current power) of Leia and Anakin Solo (both of whom possess undeniable attunement to the Force) and is only just able to defeat DE Sidious in lightsaber combat.
So, from that instance - we know Sidious is a heavyweight in saber dueling, not unlike Revan. I don't see Revan owning Sidious at all, though there is a very good chance that he would win a duel, eventually.
Secondly, no one on Bane's team - not even Revan - has displayed the Force feats that Sidious has. A Force Storm can obliterate an entire fleet of ships, people, and - when Sidious wills it so - he can transport people into space, of which there is no survival (I don't think).
Dooku, Vader, Maul, and DE Luke are all sufficiently skilled to take on the other combatants for at least long enough for Sidious to prepare a quick Force Storm (which, as I said, only takes less than a minute). I am sorry, but, Revan can't cut down these four in thirty seconds. Not even with Bane or Kreia.
Not only that, but Sidious could simply - as Glentract said - put a few of them into space.
The fact of the matter is, the only possible way that Revan, Bane, or Kreia will survive this is if all three attack DE Sidious. If that happens, then Sidious's team is screwed. But if not, Sidious will beat them.