Your supposition seems to be that the Denver O-line is to blame, but the empirical evidence suggests otherwise. In 5 games, Kyle Orton was sacked 9 times, almost twice a game. In 2 games, Tebow was sacked 13 times, almost 7 times a game. The Denver O-line didn't go from being able to protect the QB to not protecting him in 1 game.
amd why couldn't they? New quarterback, new plan, o-line fell apart.
Further, if your supposition is that a good QB can't make a team better, how do you explain the 2011 Indianapolis Colts when compared to the 2010 Indianapolis Colts? A good QB makes the entire team better.
As my football coachy hubby said...Colts have bigger problems that just Manning being injured. The whole team is in sad shape....same with Broncos. Tebow is a leader, he has charisma, if he cannot make the Broncos better, the year is gone anyway.