I wouldn't discount his size, but if we want to move Smitty to the slot we cannot draft Cooks... Between Smitty, Olsen, and Cooks there wouldn't be enough snaps to justify taking Cooks with our 1st pick. With that said I believe Cooks will be a stud, just not our stud.
There are many other directions we could go, such as Devante Adams, Jordan Matthews, or Kelvin Benjamin with our first pick
PS- I think Jeff Janis had the best workout among the second group, I think Prohl could turn Janis into a solid number 2 if we drafted late
Cooks doesn't need to be strictly lined up in the slot. He excels stretching the field and high-pointing the football. He has the body of a slot-man, but his game tells a different story.