I don't buy the first bit on the grip came from Hogan:
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First the club must be gripped (lightly) correctly the left hand should be in such a position that the V formed by the thumb and index finger points to the right shoulder. The right hand grips the club so that the V formed by the thumb and index finger also point to the RT shoulder. The small finger of the RT hand overlaps between the small finger of the left hand.
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Hogan was so detailed about the grip in 5 Lessons - for good reason. Gripping the club EXACTLY as he described, sets up the rest of his moves.
The key is that almost nobody grips the club correctly in the left hand as he describes, under the heel pad with 'support' because to most this feels too restricted. Too 'diagonal', and too limiting of the wrist cock. In reality, this sets up the left wedge and keeps it.
This is why he loved thin, tapered grips. You can't have large grips and really get the club under the heel pad properly if you have average size hands.
The second part of this is that when you grip the club in the left hand properly, it will tend to setup closed - which is why he had his grips turned 'open'.
Nick Price seems to me to have gotten it right, per Hogan's detail.