I always thought he looked at least MOSTLY Cata. It's in his expression & face, for me. I have a blue Cata on my Flyball team, named Smokey. He's such a cool dog, and has the exact same face. This boys face definitely reminds me of Voodoo:
This is a Bully x Catahoula - he looks waaay stockier, and bullier, than Voodoo IMO.
Actually, the Cata x Pit Bull cross is very common. I've seen quite a few... they all seemed to have a bullier face than Voodoo, though. People do it to produce merle Pitties, and sometimes to add gameness.