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First, when there are more people, negotiations can be more persuasive. Second, we didn't take Anders to avoid an ambush – letting the inquisitors go would be extremely foolish, and we weren't planning on a peaceful resolution to the situation. Third, Kasha didn't advise you to go there because the inquisitors have an anti-demonological ability – all your rolls against them are minimal. Presumably, he also recommended converting Anders for the same reason. In short, we will almost certainly have to fight the inquisitors, and therefore it is desirable to have the entire squad.