Hmm. Interesting game.
Data is maybe the only one who really could be excellent in any position. I even see him as being a great counselor (certainly better than Troi). His perspectives always shed more light on the behaviors of those around him than anyone else's. It's fairly obvious that he'd be great at everything else.
How could an emotionless android be a better counselor than a partial empath? Deanna Troi might also be a good substitute for Mot.