There is so much wrong with our passing game and to me it starts with the OC.
In watching our OL play, I go through each play multiple times (haven't started the Iowa game yet as my recording of it started after the Ko TD, so I'm waiting to watch the game in 60).
When we throw the ball, there are many times that we have multiple receivers out in a route, but it really looks like Tanner has one option to look at and nothing else. If that guy doesn't get open the play is doomed because he has to wait to see if he will come open and the other receivers routes are so simple/poorly designed that they aren't ever open (It looks like they are just running a route to tie up a defender or clear out a space but know they are not going to be targeted so they don't work to get open or he doesn't have enough time to go to other looks.
One play late in the game MBS ran across the field and was open, which was pointed out by Lauranitis that Tanner missed seeing him. If you look at Tanner on that play(or any play for that matter) he isn't scanning the field for an open guy he is focused on one guy, who happens to be the receiver just outside of MBS. He isn't open so Tanner can't throw it to him and by the time he comes off that read it's too late to see MBS.
To me the passing struggles are because he isn't allowed to read and react to what he is seeing on the defensive side instead he's looking at the sideline for direction on which player to target and when that first (only) read isn't open there isn't time to look elsewhere and other receivers aren't doing enough to get open because they know it's not coming there way.