User blog comment:Black leg hunter/DEVIL FRUITS ??/@comment-94.68.151.238-20130711233147

Oda said that a certain professor gonna explain the mechanism of Devil Fruits in that old SBS indeed, but unfortunately I feel that this line is already revealed.

I think he meant Caesar Crown and how Smiley tranfered his powers in the closest related fruit. Yes, we hadn't a real explanation of the mechanism, nor a satisfying dialogue, but I feel that he decided to give an optical explanation. It is usual to change his work anyway.

K