A successful downfield throw requires a lot of precision between QB and WR. At this point there are small issues with both right now. A few of them have been on Chesson, and a few have been on Rudock. In the Utah game, Chesson slowed down on one he would have had if he would have maintained his speed. On another, Darboh could have gotten it with a little more effort. A few have been over Chesson's head though, or just a bad throw.
The thing is, it is highlighted because we throw downfield so infrequently. Every QB is going to miss some of those throws, but since we try 1-2 times a game and haven't hit them, it seems a whole lot worse. If you took a QB who threw downfield on a regular basis, he would easily have more downfield incompletions than Rudock, he would just have a ton more attempts.
The weird thing is, Rudock was actually pretty successful at these throws at Iowa. Arm strength is part of it though, a few have been too linear. A bit more air under it and they are touchdowns. If you ask me though, I think a little more chemistry and a little more technique drilled into the WR's heads and I think we can hit some. One thing Chesson has shown is he's not very good at adjusting to the ball in the air.