[dlam]

Zone 3- hands/wrist hinge motion only can be expressed in RPM
Zone 2- arm/shoulder motion in an arc motion can be expressed in RPM
Zone 1- body/pivot moves in a rotatory fashion can be expressed in RPM.
Trevino had an interesting illustration in his book expressing these zones as gears, the torso being the bigger slower gear and the hands being the faster smaller gear and how they have to rotate together like a crankshaft.

Now a hands controlled start up will work but takes "strong" hands to drive the pivot.
A pivot controlled takeaway will also work but the hands must be passive enough to allow the slower pivot to initiate the takeaway.

IMO that's what I see when I look at E.Els vs K.Perry start up at address.
There are 3 zones of moving parts in different orbits with 3 different RPMs. Who is the conductor of this orchastra?
Hint there is no wrong answer.