I don't understand why you think that the hands move away from the target to keep balance.
I think that Hogna's hands move away from the target because the shoulders have started to turn and that throws the clubshaft away from the target as the shoulder turns from 100 degrees to 70 degrees.
Consider a photograph of a good golfer hitting an iron -seen from above.
The figures represent the degree of torso-pelvis separation, and the degree of torso-pelvic separation decreases in the early downswing because the shoulders turn faster than the pelvis in the early downswing. Note as the right shoulder turns around that it must move away from the target, and that causes the hands to also move away from the target.
Here is the result of a study measuring many different values - and you can see that shoulder rotation speed exceeds pelvis rotation speed by the end of the early downswing (lead arm parallel to the ground).
Regarding release of power accumulator 4, doesn't that happen from the start of the downswing - due to muscle pulling the left arm across the rotating torso as the torso rotates around in the downswing. The muscles colored in red in the following photo are the relevant muscles pulling the left shoulder socket and left arm.
I think that the clubshaft stays near the right shoulder at the start of the downswing because Hogan had very relaxed wrists and the small amount of movement of the hands at the start of the downswing has not yet affected the clubshaft which lags behind the hands.
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