I agree in principle with that Chief, but somebody has to call for a review on any given play, it can't be the guy in the booth or else every play is subject to his discretion, that can't work.
I don't see why not. Like I said, we usually know if there's a blown call before the ball is ever put back into play. I doubt there'd be much disruption as 99% of the time the umps get it correct. IMO a 5th ump would be in the background and pretty invisible.
having managers challenge is going to muck up the flow, lead to second guessing, and inevitably end up with a call badly blown that alters a game but goes uncorrected because a manager is out of challenges or learns of the blown call too late.
does ANYone think the NFL gets replay correct?