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I would probably get rid of Minsc too if you really want Sarevok in your party. But I agree wholeheartedly with the other two: with this party you don't need an extra tank. The only nifty thing that I've discovered about Sarevok is his Deathbringer Assault (which is a randomly based attack that happens every once in a while).. pretty devestating for an enemy.
Furthermore there's nothing special about him. He *is* the best fighter in the game, that's a given, but with this party he isn't necessary.