Interesting speculation. Would be very surprised if Celtic went for a League 1 full back. Perhaps if he performs the same IF we get to the Champsionship then maybe. Just seems a bit early and reeks a bit of desperation on Lennon's part. Calderon is no spring chicken or anything
There's no one I would want instead of Gus. But it's not really straight forward enough to say he's the best as there's so many variables in the circumstances of other managers