Lest we never forget...Jacksonville State.

Here is the reason why there was a quarterback change this past season. Go straight to LSU's first drive at the 12 minute mark. The commentators do a good job breaking down the then starting qb for LSU and setting the scene for what was to come. Look at the 13 minute mark as there is a wide open short pass extremely overthrown, 14:27 high pass that could have been caught for a first down if thrown chest high and outside at the chain. You can hear the announcers breaking down the poor quarterback play. Go to the 23 minute mark for LSU's next drive. At 23:45 he badly overthrows yet another receiver for what should have been a pick. After two 3 and outs even Miles has seen enough (This is Jacksonville state for heavens sake). The backup qb comes in at 35:25, the crowd roars with excitement and the rest is history. Watch the check down reads (37:25 mark) accurate throws with touch (deep ball at 39:16), the chains move (51:00) and the points scored on the next 3 drives. Incidentally at the 59:00 mark we see Ensminger for the first time as they talk about his home being flooded not realizing that he would lead the offense for most of the rest of the season.
Video of the full game here.
LINK

I present that to state this. Folks want to blame coaches, system, etc...for the poor quarterback play that is mainly due to inaccuracy at least in this case. One guy comes in and has poor mechanics (you can hear the announcers break this down very well) and can't throw accurately thus no first downs. The second guy comes in and runs the exact same offense with the exact same personnel demonstrates good mechanics and the offense starts clicking in all phases. Yes coaching and scheme definitely have a lot to do with scoring offense, but to blame the type of play that got this guy benched on the coaches doesn't seem fair.