DG - You wrote-: "Tommy's agruement was if your hands got above shoulder high the start of the downswing shouldn't happend with the lower body."
Tell that to the present World Long Drive Competiton winner - Jamie Sadloski
Or, you could offer that same advice to Jason Zuback, another World Long Drive Competition winner.
I once asked Jason how he started his downswing and he stated that all he thinks of is starting the downswing with an ultrasfast lower body shift rotation movement.