In my opinion the pitiful outside defense disqualifies him to be a decent SF. I would use him at C spot, PF as second alternative (cause jump shooting big men are more usual at PF) - but this all depends on your whole team.
Not saying you can't train him in outside skills, he would benefit from higher skills at any position but I wouldn't expect him to be a solution for SF spot. To get a serviceable OD it would take half a season of one post training at PG I guess, i would center such a training around him. He could use slightly better jump shot too, so if I should choose I would start with training IS and rotate inside skill after few weeks.
After all it all depends on other possible trainees and their position (upcoming draft included), this player can be included in many training schedules, he won't be the fast learning one, but is pretty balanced, so I wouldn't insist to train this or that skill just because this one needs it if other players could benefit from different training.