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Shinichi would have to establish an alibi, too, though! But he has seen through enough criminal's attempts at a secure alibi that I'm sure he would establish an air-tight one. Wouldn't that be intense to see Shinichi utilize his abilities and work things backwards — instead of deducing the criminal, he walks in their shoes! (Well, minus him killing anyone!)
Vermouth is devoted to Shinichi and Ran, so it seems. So it is a possibility — though I wonder what the "Pandora's box that must not be opened", means.