The huge boner was trading away the only experienced QB on the roster in AJ... that said, an even bigger boner was not bringing in a seasoned veteran to tutor Allen (and Peterman). You could also argue they should've kept TT around along with drafting Allen.
But to trade TT, and then trade AJ leaving the reins to a 5th rnd second year pro and a rookie, without doing anything to beef up the OL, just reeks of incompetence.