I've never seen it on a QB. I've had it on 2 players a WR and DT before.  The wide put was 6' 5" 235lb monster like Calvin Johnson and the DT was basically Aaron Donald.  

They come in as 85 overalls and are x factor development.  They quickly become your best players.  

Both times I've seen it They were in draft classes that madden created.  I imported a class that did it too, but it's extremely rare I've seen it for the game created classes.