Steve how does the shaft stress for the players that hover the club prior to takeaway?
Does not need any contact with the ground and I do not think that's the point here anyway (even if there was some).
When you accelerate the hands (change in velocity), the shaft is going to be stressed by the acceleration forces. Inertia of the clubhead does it.
In takeaway you start from zero velocity (or could even be a change of direction if you start immediately from a forward press). Speeds and forces and much smaller in takeaway than in startdown, so things are less obious, unless you keep your wrists loose enough to let clubhead really lag behind.
At which point it becomes LCT and not "one piece" (or can it be both at the same time?) might be hard to define and even harder to see from video as there are infinite number of degrees of lag.
From physics point of view, there is some stressing of the shaft even if you start by moving the clubhead by bending your wrists first, but that's not the point here I suppose.