There is no later on when it comes down to a lot of different training... I don't quite understand your argument. If he wants a complete player that he can use for seasons to come it is more important to get his secondaries down and then work on primaries since U21 NT is not a priority for him. OD and PAS are the most important now, followed by 1v1. If he wanted this guy to have a chance at the U21 NT then I would be giving much different advice.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs