If you're good, your good. Definitely didn't hurt Jason Tatum. Didn't hurt Kyrie. Ingram.
A lot of those guys weren't really that great though. Jahlil you could call from a mile away, couldn't play a lick of D. Tyus jumped too early, but capitalized on championship hype.
Zion is on the Kyrie/Tatum track. Remains to be seen if he can reach his potential.
There's definitely something to be said about that. I mean there were plenty of guys that made the jump straight from high school to the NBA and had great careers (Garnett, Kob, McGrady, etc.), so if you're good you're good is definitely true. I guess the point I'm trying to make is that when you look at the top recruits, the one and done players, that Duke has had, and then the ones Kentucky has had, it seems like in the long term the Kentucky players fair far better.
Over the past ten years here are the relevant one and done players from each:
DUKE: Kyrie Irving, Austin Rivers, Jabari Parker, Jahlil Okafor, Tyus Jones, Justise Winslow, Brandon Ingram, Jayson Tatum
KENTUCKY: John Wall, DeMarcus Cousins, Eric Bledsoe, Brandon Knight, Anthony Davis, Michael Kidd-Gilchrist, Julius Randle, Devin Booker, Karl Anthony Towns, De'Aaron Fox, Bam Adebayo
And 6 of those 8 Duke players were a top 3 in their recruiting class. My point being that they were the types of guys who were already good as you said, they didn't progress in their sole college year. If you're a player who knows you are going to the NBA but are forced to go to college for one year wouldn't your biggest goal be progression? Duke has caught up to Kentucky in recruiting absolutely but Coach K has a ways to go in NBA readiness progression compared to Calipari.