Remember..."Pitch elbow" is as much about "right forearm" as it is about elbow.... if that single statement is correct ( ie. my interpretation is correct then it may be a landmark in my understanding of TGM

)
Pitch Elbow is an option, a component, which is suited to :-
-swinging
-Drag load/float load
-tends towards late release ( max trigger delay)
... I think.
The deeper the pitch elbow is held... the later the left wrist uncocks ( hopefully ,in swinging, due to centrifugal force)... and there will be associated right shoulder down plane movement to get the right elbow down into pitch...
BUT these are all positions seen on high speed cams etc... and whilst you can learn to swing using positions... i think Homer thought it better if we swung using lag pressure.... creating, sustaining and manipulating it ( directing it at appropriate aiming point)
A swinger is recommended to drag load/float load and... by 7-3... have the forearm( and hence elbow) in correct position ( my bold and underlined):-
"7-3...
Right Forearm Position at the Top differs for the Angle and for the Arc of Approach procedures. So their Elbow location and action differs also. For Hitting (10-19-A), the Right Forearm should be precisely in-line with - and directly opposed to - the motion of 'the on plane Loading Action (7-22) of the entire Primary Lever Assembly (G-A), not just the Clubshaft, and this alignment maintained through Impact (2-J-3 and 4-D).
For Swinging (10-19-C), the Right Forearm should he precisely in-line with - and directly opposed to the motion of the on Plane Loading Action of the Secondary Lever Assembly (the clubshaft) and this alignment maintained through Impact in compliance with both 6-B-3-0-1 and 10-11-0-3. "
What this boils down to is a swinger loads the lag pressure against pp3 turned to top of the shaft and this results in the look of having a right elbow that points more down than out....
So more like Sergio's position than Ted's ...
The fact that it is pointing more down makes the journey to pitch position easier , i think... !
Once loaded lag at top/end in correct manner.... to get pitch position deep and max trigger delay ... just aim that lag sensation at an appropriate position on the planeline ( more forwards than backwards is usual...)
and that is it... do it in slow motion ( downstroke waggles) and it will be learnt... that way the sensation of aiming pp3 will give you a feel for the appropriate path of the hands on the downswing...and your elbow /forearm will do the right thing naturally if you sustain lag sensation...
Then at full speed you swing your hands along that path and the pp3 sensation will be sustained and aimed correctly... hands controlled pivot... i think...
Wait for the big boys ( i only study 15 months now, Yoda done nearly 30 years.... Homer did over 40!)... but that is the way I see it at moment.
Remember that the imperatives are more important for good impact alignments than the "look" of pitch elbow on downswing... pitch just gives you a bit more clubhead speed... useless if your alignments are off!