Brianid it ain't about strength! The reason why he would dig intothe ground is because at address his shoulder to ball radius is x amount and then he drops down which would make him dig under ground the exact amount he dropped unless he makes a series of compensating moves.
By strength I mean the need for it to be able to close the face via PA3. The more PA3 angle you have, it's more difficult to close the face, hence more strength you need.
I think the shortening of the shoulder to ball radius is not a fault, but a compensation for having a left wrist that is uncoocked more than level at setup (sorry, his left wrist is not level at setup/impact fix), and then having a level and flat left wrist at impact. If he doesn't "dip", he will whiff the ball, not hit the ground.
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