The DFs being engineered by humans is interesting. I just hope Oda doesnt go FMA way, hell I like that way. The World Government using live humans to create the DFs during the Void Century. That's one big secret the WG will do anything to keep, to the point of eradicating even whole islands(robin's hometown).
Also, Monosuke as new SH crew? There was a good dynamic between him and Luffy
Naaa, too young. Moreover Luffy wants him as food, see how he drools.