I see your point at center, also your point with Diaw. I mentioned elsewhere that someday soon Diaw is going to coast himself out of his own spot. He does show up for big games and the postseason, so it's really not a concern for this season, but for the next one, he needs to start considering the glut of young bigs the Spurs have in the pipelines.
Aside from KA we will also have Bertans and possibly Cady as well. I expect D.West to return. He's been healthy, has played well and if we don't ring this season, he will still be ring chasing. If we do ring, he'll want the B2B. I don't see LJC coming over though. He's too undeveloped and without a reliable jump shot I don't see him getting a spot over any of the above young forwards. Like you, I also don't see us carrying too many rookies, specially young undeveloped rookies, which LJC would be, bc at least Bertans seems to have one NBA skill-that sweet 3 pt stroke at his size, while Cady spent the token dleague season already.
However none of those guys is a defensive big (LJC is, but he's raw), so there's room to pick up someone, but I'd like a guard.