Booker Was Older and Only a Marginally Better Scorer
Booker averaged more points per game on better shooting percentages when comparing his and Primo's freshman seasons. But even with Booker being drafted as an 18-year-old, Primo is still a bit younger. In fact, he represented Canada’s under-19 team at the age of 16 and played his first eight games at Alabama as a 17-year-old.
Admittedly, Primo received only a handful of minutes on the Canadian U19 National Team. But the fact that he played NCAA games as a 17-year-old in the SEC and still put up good shooting numbers should not be understated.
At an age when many kids still may not even have a driver's license (including myself), Primo was scoring buckets against some of the best college players in the country. There is absolutely no reason to suspect he won’t be able to match Booker’s production once he earns regular minutes with the Spurs after developing in the Summer Leauge, Austin, and possibly even on the Spurs’ bench.
So far, Primo is just a baby step behind Booker, but he’s also a couple of months younger than Booker was at the same point in his career. For a player that was mocked pretty consistently in the late first round to the early second round of the draft, Primo's production is not that far behind Booker's when he was at that age.
When the Suns drafted Booker, it was because they assumed he would make a leap in the league with a more significant role on the team (and he did). Essentially, the same thing can be said about Primo coming to the Spurs, so I think it'll be more of a matter of asking when Primo takes that leap rather than asking if he'll take one.