more lateral strength from the radial spokes, while still being able to transfer drive torque to the rim.
makes sense to put more lateral strength into the drive side of a 8/9/10sp rear wheel because of the reduced lateral strength from the dishing.
Can you quantify the amount of strength a crow's foot pattern adds? Are you concerned that crossing 3 spokes at the same spot reduced the clearance between the spokes and the derailer?
em