Isn't a rolling CB with no side spin much easier to produce than a stunned ball with the exact amount of natural running side required for gearing? Many one-rail kicking systems (e.g., 2-to-1 through diamond and mirror systems) are built around a rolling CB with no spin for this reason.Ditto (unless it's a stun hit with measured running english).Running side is very important with multiple-rail kicks; but, IMO, center-ball is more reliable with one-rail kicks. Any slight error in the amount of side has a big effect with one-rail kicks.
Regards,
Dave