Have him make sure that 'Airport' wasn't part of his training material!!
Seriously though, congratulations. Considering they've been talking about upgrading the ATC for a decade (maybe more), I could see it be frustrating having to learn a new job on potentially antiquated hardware.
As far as 'JAX Center' goes, I'm sure a search (or post) on Flyertalk might get the answer. It wouldn't surprise me that 'Center' centers handle more routine, in the air flights, vs airport towers, that handle landings, takeoffs, and taxing.
Does he live around JAX, or did he need to relocate or commute for it?
Jeff