Both Aerial defender and Defensive wall seem to be useful - I have DCs playing with them.

Btw, it would make a lot sense for a DR or DL to have the Dribbler ability, especially in formations that don't have MR/ML. But I hear that the game doesn't allow for certain positions and as far as I can remember - I haven't seen one. Does anybody know if you can get one and if yes - does he do well on the flanks with it?