Tiny spoiler for those that aren't caught up with the current chapters (about the last ten or so). Also this thread is retarded.
I have been wondering something that's a little bit silly: does someone have to eat the entire Devil Fruit? I mean, can one just take one bite for the fruit to take effect? All of the characters shown eating one ate the entire fruit (not sure if Kaku and Kalifa actually did eat it though, but they both did comment on how awful it tasted so they MIGHT not have finished it). The thing is though, more than one person could have the same power (which would be kinda lame in most cases). I could be wrong with this (I probably am), but it's just a simple thought.
Feel free to lock this thread. Thought I'd tackle an issue that probably hasn't been mentioned. >_<