Balk Talk

[Lapopez]

In my list of balks, the following two are consecutive:

a) Pitches from the windup position without maintaining contact with the rubber.
b) Pitches from the set position with his pivot foot outside the end of the rubber.

5a. Was it deliberate that these were presented consecutively? What I mean is, was the author purposely distinguishing the windup and set? This bothers me because (a) should apply to both the windup and the set.

5b. Regarding (b), is it practical to be very strict on this, especially in light of the way Evans presents this in his video where he said it is acceptable for the pitcher to at least have half of his foot adjacent to the rubber?