The warm up stage ceases to live up to its name; the combatants therein die painfully and with minimal effort.
1.) Sidious and Marek win comfortaby; Mara Jade's cunning tactics are the only remote challenge here, but Palpatine knows all of her assassin tricks and would be able to respond in kind with greater Force power.
2.) While a strict lightsaber duel might yield a much different result, the dark siders are simply far too powerful with the Force to lose this match. They win comfortably.
3.) Malak would provide a decent challenge for Marek, but the older Sith simply hasn't demonstrated the refinement or raw power strong enough to contend with Marek; Revan is a prodigious Force user, but is no match for Sidious, who matches him in cunning and exceeds him in Force strength and knowledge. They win with slightly more difficulty than the last match.
4.) Count Dooku is a swordsman and Force user of legendary repute, who has demonstrated a remarkable mastery of telekinesis. That said, though he is undoubtably very powerful, his whole personage and method of fighting relies on precision and refinement; Marek has demonstrated a primal command of the Force far surpassing his. Caedus is a monster whose combat skills allow him to contend with Luke Skywalker and surpass him in some knowledge areas; he is no doubt as powerful as Starkiller and the beneficiary of superior knowledge. However, Palpatine is more powerful and knowledgeable than any of his opponents -- one of whom lived in fear of him for the last decade of his long life. Palpatine would defeat Caedus with, perhaps, considerable difficulty. Starkiller would do the same to Dooku. In the alternative, Sidious would finish Dooku before Caedus finishes Starkiller. And then it comes down to Palpatine vs. Caedus, where the true Dark Lord of the Sith emerges victorious.
Boss stage:
Here I'm iffy.