I wouldn’t spend another scholie on a rb. PWO can be camp legs, if there was ever an emergency they or kids on defense or WR could be moved. Lots played both ways in hs, particularly the running backs.
I can only think of two times where going beyond three was an issue, and that’s when Tebucky played vs VT and had a great game, and that was as the third guy, and the Diamond Ferri extravaganza.
Three is except very rare occasions, enough