Broncos coach John Fox is prepared to pull Tim Tebow if he struggles against the Steelers on Saturday, according to multiple sources. It was reported on Friday that backup quarterback Brady Quinn took about half of the snaps with the first-team offense in practice this week. As one source explained it, Broncos players don't regard the development as a big deal. It's no surprise that Tebow hasn't been the same guy lately, with as many turnovers in the last two games (six) as he had in all of the prior 10 games combined.