Zay is interesting for me. I live in Greenville, NC and have seen him up close many times. Initially I would have agreed with you, but after hearing what some of the coaches here have said of him (I have a cousin on the staff) the consensus is that Zay was limited by the system, not the other way around.
He has been practicing like a pro for the past 2 years. His father and uncle were both pros. He has worked on all the routes and all the finer points of playing WR at the NFL level for 2 years. If he isn't our number 2, there will be a lot of people who know him very well as a player that will be surprised.