Being passive doesn’t imply it isn’t employed. The right arm always- ALWAYS- is straightening. From address to finish, all the right arm wants to do is become straight. The Left arm prevents that on the Take-away (Checkrein Action) but nothing prevents that on the Down Stroke. It isn’t the power source number one accumulator a hitter uses but it is the motion number one accumulator a Swinger uses to stay On Plane.
When is it straight? Just PAST Low Point. At Impact the right arm is still bent. So some might feel it not ever straight. It isn’t at the ‘moment of truth.’
A ‘true’ Swinger that relies solely on CF should have no problem with the power generated by the Throw-out to straighten the right arm.
Hybrid Mode
