He had the ability to hire some real fancy pancy printers in the day, I swear its pyro without the stain.
No I do not think he processed them himself, though I am sure he looked at every negative..
Lots of people used a mature replenished line, others flew with film to Picto to have it developed by inspection.
He was with the same group as Irving Penn and that dude really pushed the envelope when it came to film and printing, so I think for that period he could very well have been using pyro.
Penn and Avedon were great, and would leave no stone unturned.
There are/were Replenished non stain Pyro dev.
Best of both world.