...and I knew this would seem (and probably is to some) petty...
but look at the big picture.
If you have one official going to the huddle and the other official standing at the TO spot with a finger in the air...it's just not clean, IMO.
Check out the Pro football officials when a field goal is made.
Both officials confirm the goal and walk out with arms raised at the same time. Looks good...why not be syncronized? I mean, check out those swimmers...don't they look good?