Instead of the Rocs, I'll suggest Makos. The Mako is stable neutral, so any significant fade or turn comes from the throw and provides good feedback. They also help when learning to control how much fade or turn to put on a throw to shape a shot.
He's got DX Rocs so he should be fine. He could mix some Ontario Rocs (or Comets) in there if he really likes Rocs. If I was doing this over I'd get a bunch of Eagles and Rocs in DX for field work.