Since Grossman
didn't win his first Super Bowl, your looking at winning QB's is not very relevant.
Grossman is a loser, please Bears fans, especially the ones who were saying Grossman was good enough to beat Colts (and the Colts did not play like world beaters)...check yourselves into some rehab and take a good look at this bedwetter....
AAA, we can both think of probably 20 QB's off the top of our that give them a better chance to win right now....and can you imagine Brady, or Peyton, if on the Bears, having lost that game?
Why is it that we can accept the Peter principle so easily in business, but fail to see it in sports? Grossman is bedwetter, get used to it. During the regular season, no pressure, he choked things away. So it was not just Super Bowl jitters. If this was a cool cat and he had one bad day in Super Bowl, that is one thing, but that is not he case here.
The window can close sooooo quickly, injury, jail time

, suspensions, free agency, other teams improving, etc.
Get er done NOW!!!
No excuses.
Quote from AAAintheBeltway:
16 out of 23 didn't return? But what are the stats for QB's who won in their first Super Bowl?
I think the key is that Grossman is a work in progress on a team that is ready to win right now and which probably doesn't get better from here. They don't need John Elway, but they do need someone who will not give the game away.