Your guy might be best as a PF.
If you are sure you will have the money and GS management to keep him, I would try to get his IS/ID/REB to at least triple 13s. Or you could make him an ID or ID/REB specialist. You should BB-Mail fewmit for a general idea of what his skills need to look like.
If you are willing to sacrifice anywhere from a half-season to a full season train secondaries, he might lose ground and not make the team. If you don't mind him not making U21, I would do a whole season of 1v1 Forwards, with a little OD training mixed in. Not only will this keep salary lower than pumping primaries, he will also be salary efficient. I would stop training 1v1 when his HA/DR are at least average. Then I would pump his primaries, while throwing in a few more secondaries, like PA.
He's a nice player. Good luck training him.