I think Michael/Nitro wanted to go further than just swapping names. That he'd start to use the old account again and drop the newer one which is now Nitro.. so that he has an older registered date. Double accounts are forbidden, but I'm not sure if you already have two and you basically got through the system swapping them can be acted against.. I'd advise that Michael keeps using his newer account though, since it'd create confusion with his newer more recent posts not being searchable on his active account then. His newer account is his newer identity, and there should be easy access to recent posts by this user, and not only the old posts.

One thing that needs to be clear at least: do not use both accounts actively.