No, that's not possible: Battler but also the rest of the cast didn't find the corpses at all.
They couldn't be "dead" because if they were dead when Battler found them in the morning, their corpses would have been moved, which is denied by the stakes.
Lucifer even confirmed "
Therefore, the corpses couldn't have gone missing after being discovered!!".
Quote:
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よって、遺体発見後に遺体が消失することはありえないッ！！
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Ergo, none of the first 6 were dead before Natsuhi breaks through to see Jessica's "corpse".