Offsetting or not?

[whitehat]

Originally Posted by Robert Goodman

What if he had never been on his side of the neutral zone since the ball was made RFP?

There are allowances for entering substitutes who may run onto the field, (across/through the NZ even) after the RFP and after center touching ball. If they do not get onside before ball is snapped then we would have an Ill sub foul. (sorry don't have rules books a with me for a ref.).
If while a sub is running onto the field (on B's side of the LOS, lets say) and B encroaches, I am thinking by rule we have encroachment on B. However, by fairness and common sense I would think about offsetting them...until I find my rule/case book that may instruct me otherwise .