Pretty telling article on Matts deal
In the end, Cardinals officials agreed to an escalator package similar to the one featured in the contract of Jacksonville Jaguars quarterback Byron Leftwich, a first-round choice in the 2003 draft. That contract, also negotiated by Condon and Kremer, stipulates that the escalators were triggered if Leftwich participated in 55 percent of the Jaguars' offensive snaps for two seasons, or 70 percent of the snaps in one season.
Under the Arizona proposal sent to Condon on Sunday, Leinart could have played every snap in his first three seasons, been injured in his fourth year and unable to play, and would not have realized any of the escalators in the deal. That proposal would have made the escalator thresholds the most difficult to reach of any quarterback chosen in the top 10 since 1993.