That's actually an interesting idea. Usually we've had 2 good guys vs 1 bad guy who is match for the 2 good guys alone. Would be interesting to see 2 bad guys vs 1 good guy. Thing is....I can't see Grievous and Ventress working together.....but it is a good idea nonetheless. I can see though something like Ventress getting beaten or schooled by Mace (it would be a pleasure to see that given how arrogant and powerful she thinks she is), then Dooku steps in to save her and prove his superiority.