User blog comment:Staw-Hat Luffy/Luffy wants the fruit WTF/@comment-3177613-20130328193633/@comment-4605926-20130330153602

I believe that the ability to indirectly consume more than one devil fruit is actually a unique ability derived from the Yami Yami no Mi. As such, it is probably only possible for the person who ate the fruit to have more than one ability.

That said, none of this was confirmed yet so you might still be correct, though it seems unlikely to me.