I personally think that there is an advantage to flexing the knees like Hogan in the downswing.
When one swings the club down-and-out-and-forwards in the golf swing, one of the three-dimensional forces is a distinct downward force. I think that it's likely that a golfer can better stay in balance - while maintaining all his body/spine angles and while avoiding tippling forward - if he initiates a marked downward thrust force of the club in conjunction with a piston-like flexing of the knees. It is like a downhill skier going through a mogul run - they flex their knees like crazy in order to keep their upper body stable. A golfer wants to keep in balance and keep all his body angles intact during the downswing, and if the golfer has a very forceful down thrust action (like Tiger Woods) then using the knees as shock-absorbers/stabilisers may be biomechanically advantageous. I do not generate sufficient downward thrust to require that type of knee action, but golfers like Tiger Woods and Jamie Sadlowski may benefit by using that type of knee-flex action.
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