I believe that Richardson has a great chance to get a fifth star, particularly on Rivals. He had a big junior year, but did miss some time, and if he stays healthy as a senior, I think he'll get it. The offer list is there, and the production should be through the roof. Moreover, you know with his size and speed he will light up any combine he attends.
Fluker is hard to say because he may have a position change. He has a legitimate shot at a fifth star as a defensive tackle with Rivals, but I do think he'll be evaluated as an offensive guard in the next few months. I don't see his status falling any, mind you, but I'm not sure a fifth star will be coming.
McCarron will stay put. He's highly-touted, but he would need an ungodly senior year to justify the jump to a fifth star. He'll be a solid four star.