One Piece speculation: Momonosuke is next crewmember

I think it would be terrible mistake from Oda not to make Momonosuke the next crew member: they already have great banter with Luffy and he would melt very well into the flow of the mugiwaras. I can already dream all the funny scenes this would make possible. I love that dragon scarf on Luffy in the second picture.

Only one thing that may sort of be a limitation for the possibility of Momonosuke joining is that we have nothing on his fighting abilities: He's still a child despite of dragon form, but I believe if Oda decides to show him having some skills due to his Devil Fruit that will increase chances for him to join.