Darth-Yoda; the way you set up the fights makes it seem like half of one team is watching and waiting while the others fight. Read my last post. And Revan would beat Maul and Vader, and he could take Sidious without Traya. Traya herself could fight Sidious to a standstill, if not defeat him outright.
He would defeat Qui-Gon and Obi-Wan. He did, as a matter of fact. The only reason he lost was because he was arrogant enough to let Obi-Wan live while he toyed with him. I completely agree with you. And as cool as I think Darth Maul is, I don't think he could defeat anyone on Revan and Traya's team. That being said, he could probably give Sion and de-powered Nihilus a fight, but these two would probably fight together as a team, meaning Maul is destroyed. Do you really think Maul could stand against two Ancient Sith? Maul was so good because he was the first Sith the Jedi had seen in a millenia. then again, he was skilled, but I don't think he last against anyone here. Possibly, just possibly, he could take Nihilus, but I highly, highly doubt it. He would give either of these two a decent effort, though.