Iowa doesn't get many Drew Tate type guys that come in extremely well prepared and can quickly adapt, Stanley has some tools and has done well, but at the same time he has had issues to work through on almost all aspects of his game. The type of pro style offense Iowa runs requires a fair amount of basic proficiency and awareness. That is one of the big reasons most college programs have long since moved away from that style of play. The coaching staff tries to keep the playbook simple while the quarterback gains proficiency.
Poor offensive line play has thrown a monkey wrench into Iowa's play action game. Opposing defenses are selling out. They aggressively attack across the faces of the offensive tackles and run blitz linebackers into the gaps or defensive backs aggressively attacking the edges. This has been a way to clog up Iowa's offense for many many years now. I remember a number of years back, a rather mediocre Arkansas State defense putting a clinic on how to tie up a rather experienced Iowa offense. It's a good thing Stanzi had a few good long passes in him that game. Ugly win. Stanley isn't hitting those long passes and he is rarely making opposing defenses pay for selling out.
