That wasn't me.
Then you say about the quarterback's performance: “And went 1-4 in Tebow’s last 5 starts.”
I see what you did there.
Yes, in theory Denver could have finished 1-4 despite Tebow. But in looking for factors that changed between his 7-1 start and his 1-4 finish, one thing leaps out: the unfamiliarity of Tebow's style of QBing, which of course declined with time and accumulating game tape. I'm certainly open to hearing alternative explanations for Denver's downward trend over those 13 games.
Still, Tebow was 8-5 as a Denver starter
More precisely, Denver was 8-5 with Tebow as a starter ... it remains a team game.
If opponents were studying tape of Tebow as the season progressed, they were also studying tape of Denver's offensive coordinator. And what they saw was coaching and play calling that was atrocious. For 3.5 quarters of each game, the OC called running plays almost exclusively on 1st and 2nd downs leaving the team in long-yardage situations a majority of the time they faced third down. It is much easier to defend the pass and the run when you know when the OC will call each. It wasn't until late in the 4th quarter that the OC would give up and just let Tebow be Tebow. And that's not just my opinion - others with more football knowledge have said the same thing.