If you go back and look at it, the Broncos got off to a worse start with Manning than Tebow. The offensive line was allowing Manning to be sacked as often as the much quicker and more powerful Tebow the previous season. Where Tebow would still win games, Manning was losing. I believe Denver coaches then realized they had an offensive line issue. Changes were made, pass protection dramatically improved and the Broncos went on a streak.
Let Tebow not be sacked in a game and he'll win.
Let any halfway decent NFL caliber quarterback “not get sacked in a game” and he’ll win.