Lon,
I also find it very difficult through Directions on the DVD to hear what Dave Holland is playing. I think this has more to do with the live mix. He does not have the definite sound that Chick's bass range has, and Jack's bass drum is mic'd to boom.
Even in quiet passages, I want more out of the bass mic(s) than they seem to have mixed. I guess it sounded fine in the monitors?
Still, once my ears find him, there he is. That, or the board engineer was doing what he could to gradually fix the mix? It seems to improve carefully into Bitches Brew.