Your right, Dunn has played sub-par. But he has been hampered by injuries all year. Plus, they have given a bigger load to Alstott. Last year, when Alstott was benched due to his fumbling, Dunn was given a full-time role and answered with over 1500 total yards and 9 TDs, and he averaged 4.6 yards per rush. Given a full-time role, that's the upside that Minor could give you.
You could put the blame right square on the shoulders of the truly offensive line. We went from Richmond Webb to Spenser Folau at left tackle, that's a drop of Brent Smith AND Marcuss Spriggs! Todd Perry has sucked ass. todd Wade and Tim Ruddy have been playing hurt all year and Mark Dixon seemed to have misplaced his talent before going down with an injury to end his season.
The only reason Minor looks any better than Smith is because he is shiftier and can create something out of nothing which is usually what you have to work with behind this pitiful line.
If Jay plays smart and limits his TO's then he'll escape the scapegoats' role.
If I had to bet right now on who will be blamed for our final loss, I would have to say the same people who let us down every year will do it again this year, the defense. Whether it's a lack of talent or mental weakness, this defense can't hold up when it really counts. That, my friends, is the real reason this team can't get over the hump.