Again, I feel like the Diaw comparisons are a bit lazy. Boris was a guard who was better suited to being a big due to his size. While he may not have had the agility to be a PG in the NBA, he was a great all-around athlete. I know that you might say, "Well nothing's perfect, but he can try to be a less-athletic Diaw". But that's missing the point. Diaw is Diaw BECAUSE he's still athletic. He can drive and kick like a guard because he can penetrate like one. Anderson can barely do that without the extra bulk on him. He'll also have to gain a ton of weight to be a great post player, seeing has he's at a leverage disadvantage against almost everybody. That lack of leverage will also hurt him when he has to rebound versus bigger players.
Anderson is not going to be Diaw. He needs to stay where he at least has a size advantage over other players. Instead of moving down, he needs to become more physical, kind of like Pierce or old Jack. Him having such a high release and being able to shoot well even when contested means he can get into the body of his defenders and shoot over them then they get off balance. On defense, he needs to be physical and use his length to smother his man. He'll never be great, but he can be frustrating with his wingspan and IQ. He just needs to have a ton of junk in his game, as he simply doesn't have the athleticism to be a smooth finesse player at the highest level.