if it fits your plans to train Outside shooting for a long time he might become a good playr someday.
Outside shooting trains Jump Range as main skill and it also trains Jump shot, and maybe a few other skills.
18 year olds train prety quickly. It is up to you. If you do not plan on having a lot of outside shooting training, he won't become any good, since if you wait for 2 years, he won't train that fast anymore, and it would take too long, there will be many others on the market with much better skills by that time.
They are not your friends; they dispise you. I am the only one you can count on. Trust me.