Well, I suppose I will take the contrarian viewpoint. I'm optimistic about the receivers. I see last year's less than stellar passing attack in two parts. 1) Arnaud was learning a new offense and still developing as a player. I expect him to improve. 2) Injuries at wide receiver. If you keep in mind that ISU lost a lot of time to injury from 3 receivers they were expecting big things from (Darks, Reynolds, Johnson), it makes sense why they struggled at times to throw the ball.
I think the receivers will be upgraded simply from being healthy. A healthy Darks, Reynolds, and Johnson I think form a fine base to build a receiving core off of. I'm not concerned at all about a case of the dropsies in one practice. It happens.