There are a few photographers such as Gibson, Weegee, Mortensen et all, who seem to have wacky technique. Whenever I look at their photos, though, I always think 'I could get a similar 'look' to that by doing X or Y'.... A similar look, maybe, but no way could I get within a mile of their photographs. I think their empirical route to the 'look' they wanted may be interesting, but I reckon it is the very easiest, least important, bit. Give Gibson a Hasselblad loadwd with XP2 and he'd still produce great pictures. Give me a Leica, Tri-X. Rodinal and Agfa Brovira grade 6 and you'd still get a pile of crap...