The issue with your request is that the answer IS a "'chronicle". We debated all off-season, after fat Albert stepped on Schaub's foot and ended his 2011 season, whether we should trade Schaub or at least seek out his successor. Some of us had hope - even after Doc warned us - that Schaub would make a full recovery. Few of us thought that T.J. Yates was going to be that guy should Schaub falter. Some did, since he won a playoff game. Others saw/thought he didn't have 'it' when the Ravens exposed him in that playoff loss. Hence the debate over whether to stick with Schaub or seek a replacement.
All that to say, the link you asked for below....
...isn't one article but a whole mess of threads. We argued "to Schaub or not to Schaub" Ad infinitum around here during that off-season.
Use the query function and use "Schaub" and limit your timeframe to 2012-ish and a whole lot of threads/posts should show up.