No doubt about it. There is usually a couple guys each draft where you pretty much know at worst you’re going to get a pretty decent player that will have a long career and make a couple All star appearances but by in large, it’s a crapshoot.
Zion is probably the "safest" draft pick since Anthony Davis, I think that's pretty clear. But you're exactly right, every draft, even the top guys carry some risk. Remember when Wiggins and Jabari were supposed to be hall of famers? Top 2 picks, and neither guy will ever sniff an all-star team.
I also wouldn't rule out RJ being the best player in this draft, it kind of bugs me that everyone already slots him at 3 well behind Zion and Morant.
As far as Cam goes...I see him as the ultimate role of the dice. Compare him to a guy like Deandre Hunter (who most analysts have ahead of Cam at the moment), Hunter seems super safe. Probably a starter, but not a high ceiling on him. He does everything "good," but not great at anything.
Either the light bulb is gonna turn on for Cam or it isn't. He carries A TON of risk, but his reward/upside is much higher than again an example Deandre Hunters IMO. Cam is gonna either be a multi-year all-star or a sad story of a guy who could never catch up to his body and never learned how to play with intensity.