User blog comment:Yonkou Rome/Mastering Devil Fruit Powers/@comment-3242083-20110225184254

Crocodile has an immense knowledge concerning Devil Fruits. His own mastery is unquestioned, but more importantly he knows a lot about other types. Most of our information about df's comes from crocodile, after all.


 * The ability to train them
 * The ability to use devil fruit powers by reflex
 * The existence of awakened zoans
 * etc.

He gets my vote for the most experienced DF user. Not the strongest (admirals fill that role at the moment), but the most knowledgeable.