I would think he would be well serves to get some time in some kind of sim. You can find all sorts of non-motion setups around these days.
Just because he was hired doesn't mean he can't get fired. 10 years is a long time. We tend to take what we do for granted because we do it a lot, but it is a skill set that degrades quickly.
The regionals are hard up right now, and they will work with him, but I would think a few hours in a sim would make him look real good in training. You are best off not having a bunch of "work with him" problems. It ain't primary training.