It's early to be making any projections on QB play during the season.
That said, I have been skeptical of Cade's ability to lead Iowa to the promised land of offensive success (as many on this board seem to believe). The only point of reference for me was his limited appearance last year which was mediocre at best, against fairly weak competition. Combined with his injuries, I feel he may no longer have the ability to deliver what is needed for this program. I hope I am wrong.
I am more enthused about Sullivan, who appears to be a better choice in terms of durability, recent game experience and performance.