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The Broncos ran the simplest offense in football in 2011. Not only because it was so run-heavy, but the receivers ran only a handful of routes and the passing concepts were elementary in an effort to make things as simple as possible for Tebow to execute.
With Manning in town, he will expect a level of precision and timing that these young receivers have never been expected to do before.
For example, last year, the Broncos receivers were given a route to run for a specific play, and that was the end of it. No matter what the defense gave them, they were going to run a basic route that Tebow knew was going to be there every time.
With Manning, more onus is going to be on the receiver to recognize the defense and act accordingly. More times than not, Manning is going to know the coverage before the snap—it will be up to the receiver to find the weakness and exploit it, which is something these young receivers have never been asked to do.