Six-inch volume of fire versus eight-inch theory

Why do Alex Clarke and Drachinifel assess six-inch and eight-inch guns differently?

Clarke places less confidence in achieved accuracy, so the six-inch gun's higher volume of fire gains more weight.

Drachinifel's engineering case favors the heavier shell, while Clarke places less confidence in claimed accuracy and gives more weight to observed performance. Once hit probability is reduced, the six-inch gun's greater rate of fire creates more opportunities to score a hit. Clarke connects that judgment to the gap between the Royal Navy's public accuracy claims and the assumptions implicit in what it built. Their difference concerns historical hit-rate assumptions rather than the basic engineering of the weapons.