Cephalopod
Green Belt
When you draw back the thumb, your "tiger mouth - space between thumb and 1st finger" is closed and your intention/ability to grab on your opponent's punching arm is gone. IMO, it's better to have that possibility open in case you may need it. A block can always followed by a grab and pull.
Sorry, I find my ability to turn my tan into lap sau is not impeded by my thumb engagement any more then my ability to turn my tan into a strike.
Then again my lap uses more the grip between the middle fingers and the palm, than the index finger and the thumb.
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