well the most relevant hole I see is that you need to accept the supernatural. Yes a ghost is not a witch, but does that satisfies Battler? Also your theory presume you can accept red truth as metaphorical statements ("death isn't actually death"). this would kinda suck.
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No, they never said the shed could be open by the master key.
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I can confirm this. This is the closed room of episode1. Kanon could not open it with his master key, he had to go to the servant room to get the only key that could open it. This obviously put the servants as main suspects.
BTW this episode confirms that the "master key" is actually a bundle of about 10 master keys