To move Davo into the middle for the better of the team, I feel Davis's best position is CM. I haven't watched Gomis very often but when Utd have played us, I'm sure he floats across the midfield, so he should be comfortable in RM. They are professional footballers afterall, surely as a pro midfielder you can adapt across the main 4 positions. It's a bit different as a defender in terms of being competant in a variety of positions, right footed LB's aren't to my fancy as an example, but I think Gomis could play RM pretty well. (Honestly have only watched him against us though, so I could be wrong there)