ToTSC has nothing to do with the main plot line. It has a lot of side quests, but if you already beat Sarevok, you don't have to beat him twice.
BTW, please mark spoilers!! That (spoiler)
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Sarevok is your half-bro is a major spoiler!!!!!
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Sword Saint of the HADB Clan
Waitress and entertainer at Cloudy's Cafe
Lil' Angel
