The dynamics at quarterback are different than at other positions. A quarterback tends to get too much credit when a team wins and too much of the blame when his team loses.  Generally, the backup quarterback is a fan favorite. It doesn’t take much for there to be a clamoring for the second-stringer to play unless there is an Pro Bowl-caliber starter in front of him.  Head coaches usually don’t bench quarterbacks during the earliest stages of the season. It usually takes a little time for a change to be made. Here are three quarterbacks whose starting jobs could soon be in jeopardy without improved play.  Mitchell Trubisky, Steelers Trubisky…