So a little theory that's been floating around my head recently has been around the awakened Zoan users from impel down, and the smile army of Kaidou. As we all know Oda likes to introduce vital plot points early on and expand a few arcs later (like mantra and Haki), and the demon guards remind me of the Army of Zoan users. Could these Awakened Zoan Users be artificial DF users? Could the demon guards be early experiments of vegapunks with the artificial devil fruit technology? Also I believe there is a SBS section where Oda states that if a human ate choppers fruit, they would simply become an enlightened human... Could minozebra be a zebra that ate the zebra fruit and became an enlightened super zebra? Could the value of the smiles lie in creating an army of these super users for kaidou? And as it seems that momonosuke had a legendary artificial fruit, could this be why DD wants him?