I haven't seen Dudley play. At this point I am unsure how good that schedule is. I want to say Hillside is very good but then I look at a 7-3 win over a Southern team that is now 2-4 and got absolutely crushed by something called Orange last week....so I don't know.
Richmond? Again I think so but they haven't beat a team with a winning record so again, I'm not sure.
I think there are a handful of very good teams in 4a but some of the schedules are very soft so its really hard to tell. I think Dudley has gone on the road and beat two pretty good teams in Hillside and Richmond.
Also, while it pains me to say this . I have watched a lot of SC football this year. Dillon, RHNW, Byrnes, Rock Hill, Southpointe . I think on balance it is better football than what I see in NC. Not a huge difference but coaching and physical play is a notch higher in my opinion. NC teams can certainly compete and a team like Dudley would be competitive anywhere but there is a difference.