Really? MLB Replay
 

All umpires come off the field for a replay?

Just saw this in the Phillies-Reds game on a ball that was a no brainer even without replay.

Do they do this just because a manager ask them or does there need to be some doubt in the umpire's mind?

Unless my eyes deceived me, four left and two stayed. In the regular season, I believe 3 leave and 1 stays.

I only saw 4 leave and come back.

It may have been an obvious call but that is the way it seems to be. If the manager questions it, time to go to the review.

Okay, let me rephrase. Why is there any reason why more than 2 umpires needed to check a replay? Actually, I don't know why there is a need for more than one, but I'm anticipating a half-dozen weak reason why more than that would even be remotely justifiable.

Does it matter? It's not like the game is going to be played in the meantime.