My opinion is that the term "crow-hop" should be removed from the definition, and not used as a reference in describing the "replant". A crow hop is actually an outfieler's footwork move used to gain momentum and power in a throw back to the infield - which is a desirable action. All this does is add confusion and may cause an inexperienced umpire to look for something that is not even there.
Concerning footwork, a pitcher may "leap", which is illegal IF the back (drag) foot, at any time during the pitch, leaves the ground. They may also "replant", which is the act of the drag foot stopping it's forward motion, during the pitch, BEFORE release of the ball. It's possible for a pitcher to do BOTH of these at the same time, or they may only do one of these. They are two distinct actions - both illegal. Technically, few pitchers actually crow hop, but LOTS of them either leap (airborne), replant, or a combination of both.
I would propose a definition that CLEARLY defines these two actions, and dropping the term "crow-hop". This would give umpires a clearer picture of what to look for. As Punchout has stated on here many times, the slight pause, or "hitch", is usually an indication of a replant.