No Past References?

Ever since Kurt Warner retired from the Arizona Cardinals, every person in the NFL universe said the Cards won't be the same this year. The main reason is because Warner's backup, Matt Leinart, apparently just isn't good enough. Now if the year was 2005, I would have to agree. But as everybody should know, the year is now 2010 and I don't see why no one is giving Leinart a fighting chance. The man has sat behind one of the best quarterbacks in the history of the NFL for the last three years. What other current starting qb did that? Oh yea, Aaron Rodgers and now look what he's doing. In fact, history has shown that quarterbacks who are "groomed" into the starting position do much better than those who are thrust into the position from day 1. Don't believe me? Well, a much more credible source has said the same thing, that source being ESPN with their most recent article on Charlie Whitehurst and how history shows he may be a better qb than Sam Bradford, if he ever gets a chance to start. What I don't understand is why no one is attributing this history to Matt Leinart. Steve Young, Tom Brady, Philip Rivers, and Tony Romo are four more qb's off the top of my head that sat at least one year behind a good veteran starter and ended up having great careers for themselves with Brady, Rivers, and Romo still not done yet. Whitehurst and Kevin Kolb of the Eagles also share this trait except they haven't been given the chance to start a full season. Whitehurst sat behind Phil Rivers in San Diego and now will sit behind Matt Hasselback of the Seahawks. Kolb has sat behind Donovan McNabb and now becomes the starter after the Eagles traded away McNabb. Now I don't know about you, but I never heard of Kevin Kolb or Charlie Whitehurst until recently and they have been given more positive attention than that of Matt Leinart, who everyone in the NFL universe has heard of since he entered the League. Leinart isn't exactly your classic case of a qb being groomed, but it certainly turned out that way the last three years. In fact, I would think Leinart has a greater chance of success since he has experience starting and then fell back and watched Warner from the sidelines for a few years. Of course, no one else seems to think this way, and I just don't understand why. The skill and history are on Leniart's side, why isn't the world?

Short History on qb grooming:

Steve Young --> previous Joe Montana --> result both Hall of Famers
Tom Brady --> previous Drew Bledisoe --> result Brady arguably best qb right now
Tony Romo --> previous Drew Bledisoe --> result 'Boys back on the map in the NFL
Aaron Rodgers --> previous Brett Favre --> result Favre not missed in Green Bay
Philip Rivers --> previous Drew Brees --> result SD has become dominant in the air

References:

Various player cards on espn.com
http://espn.go.com/blog/nfcwest/post/_/id/17772/bradford-whitehurst-and-qb-success