[whitehat]

High school
I find myself communciating more than I would like to wideouts and Db's. It seems they are taught to look at the official first instead of the ball in order to lineup correctly. Having said that, I usually tap my thigh and nod to indicate they are OK. This is usually only if they are trying to line up on the line. If they are back that is usally fairly obvious to them and me.
I do not tell wideouts to "move up" because as soon as you do the ball would be snapped then we have a flag for IM.

In your example this play would never have gotten off as a DB violating the NZ is a dead ball foul and the play never happens. Of course context and timing is important, if the RFP has not been whistled then the DB can get back on his side of the NZ without a foul.

I have moved DB's and wideouts back. Most often the wideout is supposed to be on the line but he is too far back...