Comes down to physics as well. If a port can flow only X amount of air, and one has Y amount of volume, what’s the Z in the equation? It’s how many times it rotates to accomplish moving that amount of air (RPM).
HP is torque over time. Generally the more rpm, the more total power because it is an equation.
Bell’s book described it well. IIRC, it was Yamaha that started making smaller and smaller case volume in the early 70’s up to the point where they were overscavenging and losing power. This is where case volume/cylinder volume equations came into play.
I used to think that the crank weights would whip charge forward and create higher pressure at the front of the case. The 462 made me realize my theory was all wrong. If forward motion pushed charge forward, it also pulled it away. The 462 feeds the transfers from the bottom through long ass tunnels. Should add to torque, as the tunnels are part of the case volume.
Think we are all saying the same thing in different ways. I think the tight cased saws need less intake timing as well, otherwise they just get a ton of blowback. The bigger case saws, like a 660 Stihl for example, need more time to fill and have more time to compress charge so there isn’t as much spitback at more intake duration. Then they may huge uppers to flow that lazy charge into the cylinder.