I like the pick for McLaurin if you are speaking strictly in the long run. Because, like Parris Campbell, he needs to put on some weight to be consistently effective. Therefor, I doubt he'll break out anytime this year.
My sleeper though would have to be Malik Hooker. He's a raw athlete who came in just in time to be brought up by Chris Ash. He basically arrived in the right place at the right time. He won't be more than a special teams player until his junior year though.