There were other prominent Jedi not at Ruusan, though...there were others like Crian Maru.
As for the Sith, the top five were Bane, Kaan, Githany, Kopecz and Qordis. Bane's superiority over Kaan in Kaan's prime is doubtful though. More than likely, it was Kaan's hyper paranoia and Bane's total contempt of the Brotherhood that led to his poisoning.