What happens when fast pace minor leaguers get to the majors?

You can't make up stuff like this.  The people who run and report on the Major Baseball League (MBL) don't seem to even give matters a second thought.

Supposedly the MBL wants to introduce faster pace play in AA and AAA ball.  But what happens when these players reach the MBL?

A fast working rookie pitcher faces a batter accustomed to jerking around.

A rookie batter remains in the box waiting for a veteran pitcher who expects the batter to take a walk and otherwise jerk around before he, the pitcher, then does his own jerking around.

How is the plate umpire to deal with these scenarios?

1. It should now be apparent that Allan Huber "Bud" Selig left a mess.

2. Rob "Bud Light" Manfred is no dynamo.  And Manfred may be questioned about his ethics in the Biogenesis trial.