My analysis (fwiw): good OD and weak IS means he leans toward being a SF; work on raising ID to OD levels; raise JR and Passing skills; and bump in Driving would be nice -- and THEN he is ready to train. Depending on you handle it, mixing it with other trainees, etc., I would guess he could be 20 to 21 then. MVP potential means you can then develop decent / very good offensive skills (although being weak in both IS and JR means, I think, career limits to whether he works inside or is good outside -- I don't see how he can be both).