Originally Posted by Mr teX
It's simply a matter of determining who's coming and who's not that the qb tries to figure out. defenses try to disquise this by having multiple guys crowding the LOS like they're all blitzing..most times that's not the case so the qb uses a hard count to see which 1 of the guys in the middle tips their hands by jumping forward/jumping back. Good hard counts can usually reveal this and the qb's/centers can adjust protection and plays accordingly.
Who is coming and who is not coming has 0 to do with determining the mike.
The qb identifies the mike so the o line knows where there initial steps and eyes should go. It determines which o lineman is responsible for which player.
And it's not even as important on passing plays as it is on running plays.
In the first game Brady was mostly calling out the mike on running plays. I was screaming at my tv yelling run.
In this past game, the first time he called out the mike I screamed draw! And sure enough it was a draw and everyone I was watching the game with looked at me.
He did mix it up and call it on some passes this game though. But I think he did that to mostly throw the defense off.
Brady isn't calling out who the texans are putting at mike. He's calling out who he's choosing to be the mike so he can get favorable blocking assignments.
In a zbs you don't normally identify the mike because it doesn't matter. O linemen make their blocking calls based on what they see and once the ball is hiked, you trust your steps.