If you have been out of your seat less than 2 years the FAR's say that all you need is a WU/PC and then a few (not sure how many) flights in the plane. They did just this with some of the over 60 guys when they came back to the left seat. This is basically what they did to me when I went to the right seat in the same plane and I had been out of the seat for 3 years so I am sure that FDX already knows that they will not have to do full training on most of us to move us back to the seat we were in.