Spinning off this rather than being critical, this illustrates how inexact an art player evaluation is. You would have given up a 4th. No GM in the league chose to draft the guy at all. Tennessee got him UDFA like we got Foster. Then they kept Jevon Ringer and Herb Donaldson over Blount who has gone off to have a 1000+ yd rookie season.
I think a large part of it is human nature.
I think Blounts draft stock fell due to character concerns rather than talent alone.