I can see how barbell work would accelerate swing progression. Did it have a similar effect on TGU progression as well?
Objectively, I don't actually know.
I don't have a clone of myself who never did barbell training as my control group.
But by crude measures, the systemic loading of a TGU is far far less that what I get with big barbell lifts (squats, OHP, DL, clean pull, jerks, etc.).
The main thing it does for me is hit unusual planes of movement and movement sequences -- like any good accessory lift, it fills in some blank spaces amongst the stabilizers.
I think it might help a bit on stabilizing near-miss split jerks.
But does it pack meat on my bones or induce an anabolic state as efficiently as a BB squat, DL, or OHP?
Nah.
Time periods where I've done a lot of TGUs has never been a time where I've packed on as much muscle as using a barbell, or even blocks with double KB.
At least not according to the Dexa scans.