The point of the drill is to get to launch position, removing all the slack from the system, so there is only a "forward part". If there is any other motion before launch, you haven't removed all the slack.
Tried it w/ DD today. There is the temptation to relax and retighten and swing. I guess that's a normal first reaction to be avoided? She wants to load again. Not sure that it bothered me, though. It was almost imperceptible. I think she got the gist of it.
Slop = Any extra movements. At go it should just be instant rearward barrel turn. No transferring weight across the pelvis. No extra upper body movements. Just instant barrel turn....
If you get to the correct launching point, with good bat angle, it seems like it's almost impossible to slop it up at that point, no? Unless you extend your hands too soon (push).
When we talk 'drop barrel,' I think of this as a sequence issue, as in don't drop barrel too soon, not until launch. Or should I be thinking never drop barrel, turn barrel rearward?