Cam's game translates better to the modern NBA than any other draftee. If you were building the perfect NBA player in 2020, that guy would look like Cam. Long arms to be an elite defender, tall enough to play multiple positions, lean enough to run the floor for 8-9 months a year, and athletic enough to be able to compete with the best athletes in the world.
With all that said...Cam needs to greatly improve on every area of his game. I think his shooting will be fine, but he needs to REALLY improve his ball-handling, become a much better passer, develop better vision, become stronger with the ball, etc.
If he can improve all of that within the next couple years, than yes Cam does have the tools to be the best player in the class. Defense won't be an issue for him, he should excel on that end very quickly.
Based on the previous year selections (ironically all Duke guys) I wouldn't put any stock into this. These rookies haven't been correct since 2012, other than maybe Jayson Tatum, however most would probably say Donovan Mitchell is better than Tatum right now. Seems like the rookies do avoid picking the top picks. Could be jealousy, could be that the top dogs are already getting hype and love, could be many reasons that probably don't matter at all anyway.