Spurs youth is fine, I don't think they are overrated.
Walker is at least a 2-way All-Star caliber player, possible franchise player - Ceiling: Dwayne Wade
White is a solid starting PG, 3rd option with close to All-NBA defense. He just needs to be more aggressive on offense and be more consistent from 3. But he's also got the starting job back just now and had this foot injury, so I assume it will take some games before he looks better. Right now he's just solid. - Ceiling: Mike Conley
Murray: People are too hard on him. He's coming off an ACL injury, it takes a full season to look like the player you were before the injury. He still doesn't have a jumper and it's often rimming out sideways, but he has clearly worked on it and has made some 3s already. He just needs to continue to let if fly and eventually he will get consistent with his shooting. His handle has also improved, but it's still to lose. I like his crossover and finishing at the rim though. With him it's all about his jumper. That would open up everything for him. So he could be anything from washed up Rajon Rondo to an efficient version of Westbrook. Tough to predict that right now.
Samanic is only 19 and the perfect modern day PF. His main weakness is not having enough muslce. I'll take that. And he's been bulking up since before the draft. He just has such a wide skill set, I think he can be a supreme role player like a Draymond Green. Not that his game is the same, but in that he can fill up the stat sheet in all 5 categories while spacing the floor and playing good defense. He can swith pick & rolls, he can shoot, he has good foot speed, he got moves off the dribble, he's a good passer and he's super young. - Ceiling: Kirilenko
Keldon Johnson can be an elite 3-and-D player. He needs some work hitting NBA 3s, but other than that his ability to get to the rim, draw fouls and finish through contact is something not a lot of role players can give you. It will be interesting to see if he can really be an elite defender in the NBA or just a solid one. That's not quite clear yet. I'd compare him to a PJ Tucker, but he could become an even better player than him
Weatherspoon was big time in college, he can shoot, he can defend. I think he's at least a bench player in the NBA - Ceiling: George Hill
Then we still have Poeltl, Lyles, Metu and if you want to count him as well, Bryn Forbes. That's pretty solid if you ask me.