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There are some Kyle Orton apologists out there who will point to the sub-par teams that he's played on as a reason for why he hasn't been more successful throughout his six-year career in the NFL.
Those folks do have a point. Orton has never been surrounded by scads of amazing receivers and lately he's had to play catch-up with other teams due to the wretchedness of the Broncos defense.
While he did pile up wins in 2005 when he took over for the injured Rex Grossman in his rookie year, he was merely asked to limit mistakes and let the dominant Bears defense control their games. Orton played decently and minimized interceptions while he was with the Bears, but he never really gained traction as a true starting-caliber player.
There is a reason why the Bears owner Jerry Angelo was willing to part with Orton and a draft pick for the more talented Jay Cutler.
Kyle Orton can have flashes of solid play, but his efficiency in the red zone and his tendency to cave quickly to pressure (his release is not nearly as fast as other immobile QBs like Peyton Manning) sink him to a lower-tier starter in the league.
Tebow may not provide a huge improvement for the Broncos in the win column. But at least there is the possibility that there could be an improvement.
With Orton, the Broncos knew after five games what they were going to get...a pathetically pedestrian performance every game.