"Keep in mind, you were never supposed to see her..." I'm paraphrasing here, of course, but even if he managed to nab Gwen's corpse and reanimate her, it was only for convienience.(sp?) He may not have known what the result of the experimentation on her would have been, but afterwards he knew what he and the C.I.A. had on their hands - a genetic cocktail attack dog... a Hulk-Lite.
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I really don't think that's the case. It seems more like Gwen is a clone using the same process as the first Carnage/Richard Parker clone