How can you justify NOT starting AJ McCarron the rest of the season?

[WeezyBengal]

How can you justify it?

At this point, us and the Bengals know what we have in Dalton. Andy has reached his potential and his ceiling is somewhere between below average (when he has a bad offensive line and offense) to above average (when everything on the offense is perfect).

So, why not start McCarron and see what you have in the guy? See if hes the answer at quarterback and see if hes an upgrade over Dalton. The season is all but over (no way this team is good enough to make the playoffs).