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In all seriousness, I'd say 85% of a Qb's "reads" are done presnap. Usually, in most route combinations, depending on defensive alignment, you will have a deep read, intermediate read, and a short read. As a Qb, you are taught to read deep to short, when time in the pocket permits. Other defensive alignments require a route underneath, pulling LBs up, a deep post pulling safeties back and an intermediate in the middle drop zone.
Zone vs. man reads are alot different. You can't always say a guy "locks" onto a wr, and know exactly that it is infact what he did. For instance, presnap if I know I have single converage on the outside with my speed guy and he's running a deep go or a flag, I'm "locking" on to him until I determine he's beating his man or not. If it's a post and I know there in single deep or cover 3 (unlikely route combo IMO) I've gotta move that guy in the middle and hope my guy beats the man under.
Watch some of Brady's 2007 tape. He locks onto Moss, nearly every play action pass and waits, because he knows presnap where and what he's seeing.
Most plays don't have reads on a single side, with a route or two on the other side that are usually the 3 or 4th read and you have on average 2.5 seconds to determine what to do.
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