Clarification needed on Encroachment vs Ilegal Motion

[jrfath]

Working LJ. Center places his hands on the ball, no one is in the NZ prior to the snap taking place (Encroachment).

1) Just prior to the snap the receiver begins his route but doesn't break the NZ before the ball is legally snapped. So there is movement prior to the ball being snapped but no true Encroachment. False Start? Illegal Motion?

2) Same scenario but the receiver DOES break the NZ before the ball is legally snapped. Encroachment still? Or is it Illegal Motion because he was moving prior to the snap as he was anticipating the snap but left early?

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If the receiver is off the line of scrimmage (not one of 7 players on the line, and is moving forward at the snap, I tend to flag live ball illegal motion simultaneous with the snap b/c he is moving forward at the snap. Same thing if a fullback or running back gets a head start on the play. If the receiver is on the line, dead ball false start.