I think it's the opposite. If Tre was willing to come here he would want the starting job and given all the minutes right away.
Duke is infinitely more prestigious and better than the Gophers and that is why he would be more willing to sit at Duke vs. sitting for the Gophers.
Riding the bench at Duke probably isn't going to get him much closer to the NBA than riding the bench at Minnesota. If he has his sights set on leaving early for the NBA, then I don't think Washington would be a much bigger obstacle than Garland.
If going to the NBA is the ultimate goal then I don't think there is a huge difference between Duke and Minnesota, if Garland commits to Duke. If playing for a prestigious college program is his goal, then Duke is the obvious choice.