Yea, this is what I got from that. His outside shot is developing, but far from developed. His inside game is good because he has a high motor (leading to lots of rebounds and put backs). However, his inside scoring game (if you threw it down to him in the post) is developing, but far from developed. Essentially he's not a "go to" scorer yet on any level - which is why it will be hard for him to make USC relevant on the court next season. They were thinking he was decent on the dribble drive when catching up high though.
I think the rest of the team is actually the big question mark. No one knows what any of them can really do. If a couple of guys can step up and be decent scorers, GG could have a major impact by playing his game (running the floor, put backs, rebounding). And then once he's comfortable he can keep adding to his game. Ideally by the end of the year he ends up as someone who could be a lottery pick with just one more year of seasoning, and in the weight room, and working on his outside shot. Bring back a piece like that, and you can find some scorers in the portal that want to team up with him.