I believe Brian Pryzybala will be a fine player for Carolina. Brian IS a very good athlete. About 6'2" and 175 or so and very fast. Brian will be a very solid member of USC's backline as long as he stays healthy and stays focused.
As far as Foster and Winstead walking on. I mean they are recieving specific grant and aid from the soccer program. They will probably recieve numerous academic scholarships. Both have a viable shot of making the team, and if they don't they will very likely be redshirted. So walking on means that the USC coaches know who they are and know that they are good, but due to lack of scholarships, the players are considered "walk ons"
Also heard Paddy Flynn might be there next year as well?