It's always nice to see our guys receive chances on big stages but truth be told, Ricky, James and Brendan just aren't NBA players. Compare Ricky to Mike Hall, who played in the League for a week or two, and there really isn't a comparison. James has explosiveness but can't shoot at a high enough level, play strong enough defense, or instinctively help make his teammates better to be a bona fide candidate. Brendan had a great final season at GW but there are just so many guys with his size and skill set that it makes standing out that much more difficult.
Jameson is an interesting possibility because he learned how to be a scorer on top of his great shooting. It didn't hurt that he played on a shitty Gopher team where Big 10 defenses could key on him and yet he still put up numbers. Then, he substantially improved his shooting while being less of a marked man on a better Ohio State team.
I'd say the next best hope of someone landing in the NBA with GW ties would be Jun. He has a long way to go but does possess the combination of size, speed, agility, ball handling, court vision and shooting touch that can be a matchup problem for many defenses.