Honestly if he signs it will be for the NXT Europe roster. Not convinced they would want to move to Europe but he and Mickie would be an immense cornerstone. Would be smart business to have a few wrestlers they are moving to that appear on the main roster for a bit first.
it always seemed to me like he is happy where he is. there is no way the wwe never offered him a contract, he has the physiqe, the look and he can be a solid midcard. i think he had an offer and refused for whatever reason.
there is that idea that everyone want to be part of the wwe. thats not true. lots of wrestlers dont even want to be a full-time and see it as just a hobby.