I will actually disagree with yoda on this one, as big and brave as I am. (and lets watch the rebuttles fly! hehe)
id give him OD training. It just makes it a bit easier to play him in the guard positions in league games moving forward - once his OD gets good enough, it makes his minutes easier to manage at the guard position for training, which in my opinion, you will be doing more of.
Also, i believe his ID is acceptable for Div IV, as most teams will play a more outside based player at SF. And even if you wanted to train him in other big skills (ie: IS) then his ID is high enough that he wont get creamed playing at C (its div IV remembre peoples!) This again makes managing training minutes a little bit easier.
The other potential issue with training inside skills first, is that he may turn into a PF, and salary wise, might go up more. WHich is fine, its going to go up regardless, but then you are left with a higher-salaried PF that you will need to play at the guard positions in order to train later down the track. This makes it a bit harder to manage salary/minutes of other players as well, and that star guard you may have just bought is suddenly not playing full time minutes....
Itss very dependant upon your current roster, which I have to admit, i havent looked it. It might actually make sense to train him as a forward to begin with if you are light on in that department.
food for thought anyways.