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It doesn't remove or cancel the unwanted radiation. That out of phase radiation is very much intact inside the cone. The cone simply confines or shields the radiation within the cone. It is not a canceling effect as though the cone was a parallel transmission line. This effect is not dependant on the currents within the radials because it is a passive shielding action not active cancellation. The radial currents control what the radiation on the outside of the cone will be and they just happen to be constructive to far field gain.

With respect to the Gain-Master versus the Vector / Sigma, If the Vector was not performing like a collinear it would radiate as a unity gain half wave end fed. Examination of that CST model clearly shows it behaves nothing like a half wave. It's longer length takes complete control of the undesired radiation with the upward flaring cone that radiates constructively with the rest of the antenna. Testing that puts the GM on the same playing field simply confirms the advanced design of the GM for lower power applications.