Either would be fine. I'd probably rack to secondary with some cacao nibs, myself. I think JZ recipe calls for hazelnut in the bottling bucket.
It won't hurt to leave it in the primary if you can't get to it, but with that much gunk in the bottom of the primary, I'd probably use a secondary if for no other reason than to make racking to the bottling bucket a bit easier. This isn't one of those make or break decision, IMO.
I'm not the first guy who fell in love with a woman that he met at a restaurant who turned out to be the daughter of a kidnapped scientist, only to lose her to her childhood lover who she last saw on a deserted island, who then turned out fifteen years later to be the leader of the French underground.