The big difference I see is that if a guy like Case Keenum put up stats like Andrew Luck's rookie season, the team would move on. But since he was a first round pick, they stick with Luck & come up with all kinds of excuses for the less than stellar stats.
Look at Kirk Cousins. After the season he had, the Redskins don't want to pay him. After the season Luck had, everybody is saying the Colts should back up the brinks truck.
With David Carr, we went through a dozen offensive linemen. Some good prospects from the draft, some good journey men. But those prospects didn't pan out, or those journey had lost a step... when in reality, the QB sucked. But we needed to be sure.
Case Keenum, Tj Yates... nothing special, but they've played better than Ej Manuel, Geno Smith, & Mark Sanchez. But Case & Keenum were sitting at home during the season contemplating life after football while Smith, Manuel, & Sanchez were on NFL rosters....
I think I'm just rambling now.