Chief,
I think your logic is really skewed. I dislike Riverside like any Chapin person should but they are a really good team. Your correct in that they did not have a winning record against 4a teams but other than the Dutch Fork lose, the rest where very very close loses and all the loses where very early in the season when you could have injuries or players coming off basketball that screws with your team. Riverside will do just fine in 4A and will be playing for a title the first year in 4A.
Also be careful of comparing JV teams to each other and to the future. There are a lot of club players that never play a game in JV, so you think a HS team will struggle because of their JV team and then the club players show up for varsity and change everything. Chapin almost always has a dominate JV team year in, year out but they has not always translated into a dominate varsity team. It is nice to have and see but it just does not always translate as a one to one relationship in Girls Soccer especially.