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In the same breath you can ask how many QBs have been benched for Brady Quinn? Multiple times!
Troy Smith, Shaun Hill, J.T. O'Sullivan, Trent Dilfer, Chris Weinke, Tim Rattay, Ken Dorsey, & Cody Pickett are all former SF49ers QBs who have started over your boy Alex "the savior" Smith. So what is your point?? Neither guys are any good.