You still don't understand the point. It's these seemingly insignificant bonuses that often make all the difference. A single point increase in a parameter can reduce an enemy's attack power by 4 (four!) times. If you swap the heroes, you'll likely get the result that the tool shows – and considering Turis's skill, it could even be as high as 95% (of the archers who will survive). But don't worry, I often play as Valeska instead of Turis.
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