Danny Ainge had elite athleticism but I rarely hear about him being an elite basketball player. Magic Johnson, John Stockton, Karl Malone, Detlef Schrempf, are just a few players who come to mind that were great basketball players who did not have elite athleticism. You mention Smart not having it but yet I see him make some key plays. Plays that really turn games around and ones that are made in crunch time.
It's going to be interesting to watch Jaylen's development since he has both elite athleticism as well as intelligence as a player. He made a couple key plays today that were based on both and going forward this is what will make him a great player.