I can't argue with your point that we're thin in the guard rotation (hence the staff's renewed energy on the recruiting trail). We're also thin in the middle (which they addressed).
But as far as KJ's status as a project, I think some context is helpful. Think back a few years. I remember BT, in his first couple of seasons (especially his freshman year), having trouble getting the ball up the court against (some) quicker D-1 guards. He didn't wind up starting his sophomore year ... and he came off the bench while he developed the confident (even bruising) handle that he displayed junior and senior years. While he was learning, JB had someone else bring the ball up-court (not all the time during his first two seasons but in a number of games). I can also recall MCW getting stripped a few times his first year. JB had to have someone else bring up the ball. It's not that unusual for a first-year player to have TO's and dumb plays -- especially when you're running the offense as a freshman and you were brought in to play 5-10 mpg as a backup to a 5 star player.
No doubt, KJ had his ugly moments (Michigan). But by the same token, he had some good games (on the road against BC) where we could see the flash (7-7) that the coaches saw when he was recruited.
I think it's also worth mentioning that we're spoiled. SU's had such a string of NBA-quality guards I think our comparative perspective is skewed. Not so long ago, JB had Dion Waiters coming off the bench. Carter-Williams had to wait a year to start.
I will say that Kaleb's defense was disappointing. He leaves his hands down, which is annoying to the staff, I'm sure. And I don't think he was physically ready for the banging, the quickness of the elite guards he saw at Duke, UNC, UVA and others. But his mid-range game was solid all year. And I think you'll see more of that, a little better 3 point shooting, improvement on D and more confidence. Early in the season, we may see G move up top. But if he's still playing there in the meat of ACC play, I think it's a bad sign (I'm not expecting it).