My definition of first-move stealing is a jump that's so hair-trigger that: On a throwover, even if R1 decided to return to the bag, he couldn't do it successfully.
Although I'm verbal and stubborn, every season some of my stealers can't force themselves go first-move.
Also, in spite of the fact that I repeatedly state, "If he pitcher throws over, it's my bad--it's on me."
I'm talking about decent, coach-able HSV players who get respectable jumps vs. LHPs, but not first-move.
edited to say:
I spend considerable energy coaching the running game. I've been doing it a long time. It takes persistence.
I'm continually amazed that some simple teaches in baseball--such as "go on first-move"--don't necessarily sink in.