Will briefly had magical powers himself as a genie. Could it be he has some kind of inside knowledge of some kind? I have no idea what that would be but he was magical for a short period of time. I do think he knows much more about the book and author than he is letting on. And ultimately, his role is a bridge to next season when many of us predict that Jafar will make an appearance.
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Keeper of Rumplestiltskin's and Neal's spears and war paint and crystal ball.