you need to be careful about what you are describing when you say "lag" and "90 degree bend left wrist" - in TGM terminology is very precise.
The 90 degree bend you see is the amount of left wrist cock ( no. 2 accumulator) or the no. 3 accumulator angle. ( complcated at first but it as accumulator 3 is turn and roll of forearm then the mechanical effect of the foreaem action is determined by the no. 3 accumulator angle - i.e the amount of wrist cock present when you do the rolling action)
LAG is an additional component that is best sensed at pp3. You can have lag but zero wrist cock - as long as the shaft is leaning forward and the right wrist is bent/ left wrist flat.
I think this is one of the TGM issues that is hard to understand because common use of word lag in golf is amount of wrist cock ... but in G.O.L.F. it is more specific.
Wait for somebody to correct this but it is something like that anyway.!
A+ in keeping the identities separate Golfbulldog!
On this note and adding to your post- let's say you started with a ridiculous amount of #3 accumulator- say 90 degrees between the left arm and the shaft. Well at impact fix - looking straight on to the player- it lines up but as a result of the turn on the backswing- now look it how much divergence between the left arm and clubshaft - 90 degrees with no wrist cock- but that sure would look like a lot of movement.
Yes, the combination of #3 accumulator and wrist cock combine to create that visual image at the top of the angle between the clubshaft and the left arm.
Also an added feature of this angle at the top of the swing would depend on the camera angle and the swing plane angle. For one example say the camera is facing the player but slightly behind the player- say opposite the right foot- then the flatter the plane the more it will look as if the shaft has gone past 90 degrees in relation to the left arm. The more vertical the plane- the less this illusion would apply.
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