Revan has some decent TK feats, right? Surely he'd be able to dispose of Grievous in some Force manner while Bastila tries not to get murdered horribly. If she can last long enough, which shouldn't need to be too long (she's not that terrible, is she?), it would pretty much end up a Revan vs. Windu, which is a fairly even match-up. Some would give it to Revan at that point, even (dunno about me, I have TOR-related biases).
Revan has some decent TK feats, right?
"Instead of charging forward, he opened himself up to the Force, letting both the light and the dark side flow through him like twin rushing rivers. But instead of focusing or channeling the Force, he released it in it's purest form."
―Star Wars The Old Republic: Revan
"And, if the situation was right he might be able to collapse a building; it would really depend on his state of mind and the circumstances."
―Drew Karpyshyn (Author)
"Revan reached out with the Force and ripped the vaulted stone archway in the ceiling above them free from its setting."
―Star Wars The Old Republic: Revan
"Before they could join the fight, Revan thrust his hand, palm up, in the direction of the durasteel doors, blasting them wide open with the power of the Force."
―Star Wars The Old Republic: Revan
"The instant before they detonated, Revan reached out with the Force and hurled the heavy stone lid of the sarcophagus toward the grenades."
―Star Wars The Old Republic: Revan
And he can levitate:
Maybe as a duelist, but why on Earth is Bastila dueling him? Unless both parties are completely clueless as to him being unable to defend himself from the Force (or just completely clueless in general), surely someone of Revan's (supposed) intellect would have the sense to go after the weak link? And not, you know, split into two separate lightsaber duels for no good reason.
Bastila covers him, he does whatever Obi-Wan did and throws a Force push that Grievous can't dodge (...seriously?), or just tosses him into the stratosphere with TK. Bastila would meanwhile have hopefully survived a second or two against Windu and we're left with the two capable parties fighting.
Sorry, I just can't buy for a second Grievous being able to stand against any Force-user with even a little skill in the Force (in a straight fight, that is; his Hypori feats are the most believable). Why duel with him when you have this whole plethora of skills that he literally can't do anything about (short of move really really fast, which Force-users can do better anyway).
Given that Revan's a mechanical god of sorts, he should be able to just dismantle Grievous' arms with a flick of his wrist.
Also, he hasn't actually dodged any TK, although it's been asserted many times. Any instances I've reviewed were something else entirely like a shift in posture or him using his magnetic soles to avoid toppling, neither of which is a dodge. Grievous is vastly out of his league.