I understand your point, your saying to effectivly use the turbine collector like a divergance cone in a two stroke system to reflect the pulse back to the valve at the right time to scavange the cylinder, no problem with the theory here from what I can tell

In a two stroke system you can design the divergance cone in such a way that it makes the pulse timing less critical and more effective over a wider RPM range at the cost of a weaker sound wave

in other words spreading the powerband over a wider RPM range and making it less peaky but at a slight drop in peak power