Your post highlights typical distortion from the error stat GO, Deledio made a blatant error by not shooting for goal, yet none was recorded because he hit Richo with the handpass.
As far as the error stat is concerned, a player could handball or kick their mates into trouble or shirk an opportunity to do better with the possession 15 times a game, yet it's completely omitted from the statistical record. Similarly, Deledio could deliver 9 out of 10 on the half volley at ankle level or badly enough so the player receiving just gets a hand on it, and as long as they touch it, no error is recorded.
So I ask again, how much value is there in quoting it as a useful stat for guaging player skill or worth?
Not much IMO.