Sure people were aware of him. That doesn't mean he was projected to go (or he would go) as high he did until he performed so well in the off-season workouts. This guy didn't go from a "known" to a 1st rounder; he simply went from an "unknown" to a mid-rounder. Same thing. Sometimes it takes really nice workouts for people to actually take a shot on a small school kid, even if he deserves a shot just based on film.
As a side note, I really like the idea of taking shots on small school athletes, because the body is nowhere near fully developed by the time they're 17 which is the time that college scouts are determining their futures.