I know exactly why Cooks completion percentage was so low. It's because it looked like he was predetermining his throws before the play even started. He was basically reading the safety and if his WR was one on one he was throwing balls up for grabs to them. Maybe that works with Dez Bryant. But it's difficult to complete a high percentage of those types of throws to most college WRs. I don't know if that was by design or not but I think it was a big reason why his percentages were so low. He very rarely would go to a checkdown. It was like if there was a blitz he was immediately throwing it up for grabs to his WR on the outside.
Yea, I also worry that Cook was playing under very ideal circumstances and he still wasn't amazing. Michigan St. is very well coached, they have had amazing defenses and running games the past two years, meaning Cook wasn't asked to win games on his own, like Goff was for example, and he was often playing from ahead and/or with a running game that made things much easier for him in terms of play-action, bootlegs and such. These aren't necessarily things to hold against him but it makes me wonder how he would look in less than ideal circumstances. He was very much an AJ McCarron like QB throughout his career at Michigan St.
I think the same can be said for Wentz actually. He played with a fantastic running game/defense, he wasn't asked to throw the ball more than about 25 times a game and alot of those throws were designed bootlegs/roll outs or off play-action out of formations that kept defenses off balance. Like I said, this isn't something to hold against a prospect but it does make you wonder how these guys will look when their defense isn't getting turnovers or holding teams to 17 points or how they will look when their running game is averaging under 3 YPC and they have to win games with just their arm against a defense expecting the pass.