Lalaith, I think you missed this:
Quote:
The evil wizard may choose to inform one or more werewolves who one or more other werewolves are; but this is a risky option and should be used with great care, considering the possible consequences.
The evil wizard is allowed to lie to his were-creatures.
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So the EW can inform the werewolves who each other are, and the EW may also be lying to his wolves about who each other are. So a turned wolf is only useful information-wise if the EW has truthfully informed that wolf of who his/her comrades are.