Actually he did make those mistakes against the Bears, and against the Chiefs some would say he made those mistakes and the Chiefs simply didn't capitalize on them. I did see an interception go right through the hands of Bernard Pollard, and another one go right through the hands of Pat Surtain.
Don't get me wrong he did an ok job in those games of playing Jay Fiedler ball, checking us out of bad plays, avoiding pressure situations, converting some short third downs to help us keep time of possession....but he didn't do a very good job of moving us down the field and scoring.
As Saban would say, he made the plays in the game that mattered relative to the final result.
Unfortunately, those plays were few and far between, and if any part of our team ever loosens up (like they did against the Pats, Jets, and Packers), we'll probably lose...like we did against the Pats, Jets, and Packers.