Dennis Smith Jr.
This has been pointed out before, as he's been seen as possibly the closest thing to a Kris Dunn replacement. Anyone familiar with Smith's game knows that much like Dunn, he's an excellent defender.
More than that, he's 26 years old, which means that he's not too old for the Jazz's rebuild. Utah is in desperate need of a defensive infusion, and if they want to use training camp to see who's the best of the best, Smith is their guy.
Smith is probably best used on a team trying to win now, but hey, someone like Dunn was too, and look where he is now. A training camp invite won't guarantee that