I think another conclusive evidence to your claim is the scene where Okiya and Jodie accidentally bumped to each other as Jodie was trying to prevent Jodie from following Scar Akai outside the mall. I think Okiya did this to prevent Jodie from being seen by the BO and suspect that he already knows that a Scar Akai is roaming around the city. It would be very complicated for her safety if the BO suspects her and the FBI that they also know the possibility of Akai being alive.
Remember, Bourbon is also secretive, just like Vermouth. A famous theory here states that Bourbon did the Scar Akai thing to find Akai, whom he believed survived the Reiha Pass incident with Kir and never died.
But at the end of the episode, I was convinced that it is 99% accurate that Scar Akai isn't Akai. It's because when Scar Akai was spotted by Gin, he wasn't threatened at all. I assume that he already knew that it was Bourbon, imitating Scar Akai. That's why he said this line to Kir, "Always doing as he pleases, that bastard irritates me as usual." When Kir asked who was Gin referring to, he answered, "Like what you said, one you would wish only existed in novels, a private eye like Sherlock Holmes." This description was referring to Bourbon, as what Kir said earlier than this part.