He will most likely play the X WR spot. This is a big get, as it was starting to sound more and more likely that he'd be a Knight, but the good guys won out in the end. HUGE get!
Hooker is gonna be a safety. I think that another big weapon to look for aside from Samuel is Terry McLaurin. He's a burner in every sense of the word, and he blew up at the Nike camp out in Oregon this summer.