Yeah, I was thinking more that a good, well rounded SF has good JS/DR/IS, so that regardless of what type of defender is on him (a guard-like SF, or a big-like SF), he'll have a good shot to take.
Of course on defense, a good SF is gonna need both high OD and ID, to defend whomever he's matched up on.
Throw in the fact that good PA is important for all players, and you start to see why it's so hard to train well rounded SFs. They need just about every skill.