The over-simplification post is spot on. Let's list the changes last year to this.
1) no viable 2nd and 3rd receiving TE option
2) no Mitchell, a good blitz pickup and 3rd down receiver (and under-rated rusher), and "Danley" isn't good at pass pro at all
3) the line isn't nearly as good at pass pro, nor stable for that matter. That must be resolved immediately.
4) CJ is obviously nicked up a bit. I thought against Rutgers, on a few hits he was favoring the shoulder a bit after, and he doesn't seem to be as nimble when scrambling like he was prior (off-season surgery if my memory is good, and the "knee brace kerfluffle" in camp)
5) the WR's need for this offense as it's currently constituted is the deep ball being viable. None of them are really "short passing game receivers", therefore to get separation on those short throws Iowa needs to go deeper more often to back the coverage off...but with a suspect line, that's harder to do and part of the holding onto the ball too long problem. CJ must get better at getting rid of the ball, period.
6) CJ never truly was a very accurate passer, much like Stanzi - so even in a perfect world where the above is resolved, he's gonna miss passes one would think he shouldn't miss. CJ must be more accurate.
7) the receivers in this year's offense just plain cannot drop balls ever. Impossible I know, but Iowa can't afford wasted opportunities.
I believe Iowa will need Stanley yet this year is the result of all this. CJ's taking a pounding yet we need him to continue to be a scramble threat given the line issues (which he appears less capable of doing this year). He's no Big Ben physically, and will wear down to the point he truly does take a knockout blow.
Not pining for it to happen, just think it will happen.