In the image below you will see a supposed Gifter that was seen in Chapter 916. In his head he wears a Jolly Roger that seems to be the secondary Jolly Roger of Kid's crew, which they wear in belts and other accessories.
So I've wondered if maybe he was a member of Kid's crew, and now he and some of his subordinates have joined Kaido after his captain was defeated by the Yonko. What do you think?