One club I believe I failed to mention was Summerville . I don't know of anyone else although it is quite possible clubs such as GFC could enter 2 or more teams in the challenge league.They did in the older age groups last year.
It sure seems to be alot of talented players from SC in the U16,U17,and U18 ages. Maybe some local colleges will "discover" SC soccer and recruit some local players for SC,Clemson,Furman,and Coastal.