User blog comment:Kaido King of the Beasts/Chapter 922: Dunking on a Drunk Dragon/@comment-25654036-20181026150023/@comment-121.45.196.103-20181027025816

You can gather from whats been shown so far that Jack knew Raiou was likely on Zou and the Minks where lying. Neko and Inu might not have realised that Jack remembered/was informed that they used to serve Oden.

So if this is true than Jack was not being unreasnable on Zou. It just seemed like it at the time since we didn't have all the pieces.