Outside d is not the only factor. You also have to consider inside d. Every player can go to the basket, whether they are a SG or a C. Guards go there less often, so their inside shot will be matched up against the defenders inside d. Just something to consider.
Also, the player you mentioned seems to play at SF? So outside and inside d are extra important for him.
What about the other skills I mentioned like experience? What about the offensive skill of your opponent? Respectable in some leagues is not very good.
Run of the Mill Canadian Manager