User blog comment:Neowitch/685 - Oh, for the love of Enel, STOP TALKING ALREADY!/@comment-1595565-20121017202928/@comment-1405658-20121017210539

I mused about that myself. I figured the first two dragons were failed subjects that slipped into Awakened Zoan state, and Momo's was dismissed as "failed" because it was abandoned when Caesar's bomb went off.

If there's a stowing away and Doflamingo.. then we're going to Wano Country (Wa-No-Kuni? Japan, seriously..) where Kinemon & son enlist the help of the Straw Hat crew to keep Doflamingo's feathery mitts off their country. (sounds a little too.. Help-Vivi-Keep-Crocodile-From-Alabasta, I know) Think about it, Momo was probably still at home when he saw some suspicious activity, went to investigate and upon seeing Doflamingo (at least) he was forced to hide onboard the ship, which was heading to PH. He stowed away the whole time, and if the headcount was at the time of the initial abduction.. the comment about the "boat numbers" matching up makes sense, they missed him or don't double-check.

Wano was said to have strict rules about entry, so I don't think the "your kid is sick, put him in our van" line would fly with them.