There is no evidence of lag tension in that Brendon Devore impact image. It is obvious that the peripheral clubshaft is bent slightly forwards. That is the standard appearance of a golfer who comes into impact with the hands ahead of the clubhead due to correct timing and who is not flipping at/through impact.
The NRG image is uninterpretable because one cannot clearly see the clubshaft to see which way the peripheral clubshaft is bending. Getting the hands ahead of the clubhead at impact is not synonymous with the concept of lag tension.
Brendon also wrote-: “USUALLY I can only get a RAHM-esq impact like that with a HALF SWING. This was a full swing I believe, (full distance effort) although the backswing did feel more compact than usual, which would be good.”
Brendon seems to be implying that Jon Rahm has lag tension at impact. That’s not true.
Here are capture images of Jon Rahm’s driver swing action.
One can see that Jon has lag tension (peripheral clubshaft is bent back) at P5 (image 2) and at P5.5 (image 3) but it is disappears by P6.5 (where the peripheral clubshaft is bent forward).
Here are capture images of his P6.5 - P7 time period.
There is no evidence of lag tension (peripheral clubshaft bent back) in those capture images.
Jeff.