text: I agree with your analysis. I think the problem is that Trevor may be on the bottom end of mediocre as a starting NFL QB. There is a solid team built around him right now. Perfect, no way, but very strong in many areas of the game. Unfortunately, his play brings to light this teams most glaring weakness; the offensive line. He's not capable of lifting the line or covering for them like we saw with Manning; not trying to compare him with Manning just using Peyton as the most familiar example.
  
  If you look at Siemian, the Broncos can really only win games a certain way. Get up early so your defense can be more aggressive; rely on that defense to create turnovers or points; rely on the defense to keep the opponent off the board or to field goals; have a solid running game that keys to his play action strength; play mistake free on offense.
  
  Unfortunately, not every game is going to play out this way and when it doesn't his weaknesses become even more exposed.