3) The supergate is effectively a very small corridor, when the analogy with ground warfare is drawn. Anyone seen the movie 300? -> http://en.wikipedia.org/wiki/Battle_of_Thermopylae
also the ori are a different evolution to the humans so not directly the same so we might not be affected the same, biology is very complicated
also the aschen could plant a bomb on a planet when a battle is being waged
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