1. Darth Maul and Assaj would have no cohesion (they've never met, both use weapons that require a lot of space so it would be hard to work together that way, they both also lack the discipline and mentality to work together), whereas Kas'im and Bane know how eachother fights almost inside out, and both Kas'im and Bane are much better duelists than they are, and they're clearly stronger in the force too. In fact, Bane for one would probably be able to instakill either of them. The duo pwn through this.
2. This will be harder, as both are better than the two characters in 1, but I'm still of the belief that Kas'im and Bane win comfortably, as they are both stronger than either Depa or Sora, and they would work together very cohesively. Again, they win, and comfortably too.
3. Either Kas'im or Bane could instantly defeat General Grievous with the force, and together they pwn Obi-Wan, bad.
4. 3 opponents would prove tricky, but Bane and Kas'im are, again, much better than any of the opponents (maybe not much better than Dooku, but firmly better at least), they win this pretty comfortably.
5. Not much harder then 4, the sith duo win.
6. [quote]Not much harder then 4, the sith duo win.[quote]
7. Not much harder that the last two, the sith will again, comfortably win.
8. DE Sidious is much better than either Bane or Kas'im, and Malak's not too far behind them. However Kas'im an Bane have cohesion on their side, so while they lose here, only just.