These NFL teams do their homework. They don't just look at these guys highlight videos.
Unfortunately, Hakeem dropped some easy balls, and he took some plays off. Go back and look at the pick 6 Purdy threw in the Alamo Bowl, it was all Butler's fault as he stopped on the slant route and the CB stepped in front. GM's see plays like that on tape and you just cannot do that in the NFL. Pick 6's cost you games.
With that being said, I still can't believe someone hasn't taken a shot on him yet. He's a beast athletically and is always a homerun threat.