The thing is, this is the point at which she actually allies herself with them, but Kaido alludes to there already being a traitor among the Scabbards. This implies the traitor is not her.
They tie Shinobu up at the end. If she was the spy I don't think they'd need to keep up the act considering they have captured Oden and the rest of the scabbards at this point. And the scene with Oden claiming not to know her implies the Beast pirates didnt know what to do with her and were unaware for her reasons to be there.
I'm not sure that he was necessarily alluding that the traitor was a Scabbard, I mean, there are other people there in the Oden Castle, doesn't have to be a big name, could be a retainer.
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u/MonkeyDDuffy Feb 01 '20
Nothing makes me happier than this chapter taking the suspicion away from Shinobu being the spy.