Same reasons Steve Young (4) and Aaron Rodgers (3) staid for years as backups to great QBs. Only difference is Mallet waiting a few more years but he's another 1-2 years away from even being starter worthy.
Rodgers might have waited even longer if Farve didn't kept teasing retirement.
Matt Cassel was also 3 years but would have been longer if Brady didn't get hurt in 08.
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