Gibson's technical style is based on heavy overexposure and printing from the verrrry narrow range of tones in that nearly-black neg. It's easy to think he's just being soppy, but he carries around a body with chrome film & he nails the exposures on those so he's methodical in his madness. I actually haven't seen anyone else pull it off in quite the same way -- not even Callahan or Brandt.
Yes, I've done some research on that and have managed to achieve a very similar look that I want to combine with my own style and subject matter. I like the moody gritty look.