From Mo Pinel:
As the developer of Radical's "finger scoop" and being listed on the US Patent application as the inventor, I guess it's appropriate for me to comment.
The finger scoop was developed to increase the versatility of drilled balls.
If one of these balls is drilled with the pin above the fingers, the fingers holes will only minimally penetrate the core, allowing the core to maintain it's undrilled core height. This produces a sharper, shorter breakpoint for the drilled ball.
If one of these balls is drilled with the pin below the fingers, the fingers holes will substantially penetrate the core, reducing the height of the core compared to the undrilled ball. That results in a ball with a smoother, longer breakpoint.