Define stud for me.
By many metrics Russell Westbrook is "inefficient," but I think most people would be thrilled to get that kind of player with the #3 pick.
On the other hand, if he turns into Nick Young or something, I'm not sure anybody would be happy with that outcome.
With Jaylen, I think Corey Maggette and Demar Derozan are probably better benchmarks. Not super "efficient" players, but valuable nonetheless for their ability to get to the line and make tough shots.
If that's the type of player Jaylen becomes, he won't be an MVP candidate, but he'll be pretty valuable and maybe make an All-Star team or two.