The talk of him fighting Wilder is ridiculous. I don't particularly rate Wilder that highly but he's a huge heavyweight. Bellew didn't show he had the power to get Haye out of there after he'd done his leg in, he's not going to be able to keep Wilder off him.
Having said that, I don't see him dropping back down to CW. It's a talented division but I don't think there's the money fights there that there is at HW.