Re: One Piece 657
The possibility of Enel returning is actually a good one. Lots of characters have come back after their defeat at the hands of the SHs, and all of them had mini arcs on the cover pages.
Buggy, Croc, Mr.3, Bon Clay and mr. 1 all had mini arcs and then came back into the story and were made relevant. I expect to see Wapol in Reverie now that he has risen to royalty again, and Enel obviously discovered something on the moon that could be important to the story.
Some have theorized that he will control Uranus at some point, but only time will tell.