Germ,

Iused to do that grip with my fingers open. I was told though that by keeping the fingers open the bow moves further into the V of my hand andI can still torque the bow. The other pictures from that guy showed how the arrow reacted with his fingers in diffrent positions.I guess keeping the fingers closed is allows you to feel the middle finger slightly touching the grip for consistant grip. Not sure about that since it's a new grip for me. MDBUCKHUNTER has the link to where the guy conducted the tests if you want to shoot him a PM.

It grip took a little getting used to (about 300 shots). However, it's made a big difference in my shooting consistancy wise. I did have to adjust my sights once I got used to the grip.