That's what I get out of digging on his live DVD Brighter Days (MVD 5729). The main part of the film is vivid concert footage of him and his band Mofro live in Atlanta, 2011. He is on top and the band is a solid killer. It convinced me that his kind of swamp soul is the real deal.
Otherwise there are nice segments where Grey explains his upbringing and his music and how they relate, plays some acoustic tunes and shows you around his Florida stomping grounds.
Grey is the man and this is dope. I mean it.