Rangy, half-back flanker types are the other type. A run that provides an immediate kick inside 50 is the only benefit from running. No other points are gained. The exception is carrying over the D50 (but their kick would most likely do the same anyway). So, the guy shouldn't run to excess. Particularly disappointing is when a player busts their gut, runs 50m and then clangers the kick. It's about compromise. Is able to get away with a few less possession than a quarter-back type and score the same.
The 3rd useful version of a defender is one who doesn't play in the backline at all. These players can be a boon to the SuperCoach team. Midfielders are usually the best.
No other types of defenders are generally useful. There will be a big man or two with silky foot and marking skills. They still need to work harder than the above types for their points. In the course of a season, they have to be better AFL players just to have the same output in SuperCoach scores. Unfair, but that's the formula.
The backline is generally more consistent than the forward line for SuperCoach scoring. The disposals are usually under less pressure and hit their targets more. Each possession is often worth less than the forwards. Each team has preferred carriers of the ball out of the defensive half/50m. Look for these guys, but with the provisos above.