Easy soccercrazy, there's plenty of respect (maybe fear) of the upstate. Even SCISAFan didn't give Hilton Head a chance last year against Riverside. I believe the quote was:
"Nobody left in the AAA can beat Riverside. Riverside would have to beat themselves.
Sorry Hurst."
I've been waiting for an opportunity to pull that one out of the archives.
As for strength of schedule, its a factor but not determinitive. Frankly, the opponent winning percentages of the three teams cited are not far apart - HH (59%), Riverside (61%) and Eastside (64%). Other factors, such as the age and experience of the team, may have a more profound effect. In the end though, it boils down to who shows up to play.
Regardless, should be a good match Friday between S.Aiken and HH. Both are probably good enough to play in the state finals, but one won't even have a shot at lowerstate.
Best of luck to both sides.