Can you hit irons shots "where you are looking" if you hit down on the massively? Can you "zero out" and hit down a lot?
Yes and Yes. But good luck with the longer irons if you want to get the ball in the air some. I use to be able to zero out just about any iron with a handle-dragging, arm-tugging swing. It just gets really dicey.
My feeling—and it includes some statements made by particulars—is that Tiger Woods is hitting down on the ball WAY more than "tour average" with his irons.
For a guy who has NEVER EVER zeroed out except on accident, Tiger knows where his ball is going now, especially when he is trapping a short iron or hitting a stinger.
Personally, I think he will have to take some of that down, like in the video above, out of his swing to ever come close to playing as well as he can.
They'll figure that out at some point.