I think this thread shows that most people's definition of "old school" is very dependent on when THEY started BJJ.
I was at a Carlson, Jr. seminar at my teacher's school a couple years back. I don't remember how it happened, but he saw me do something I happened to do to my partner that kinda jogged his memory.
He quickly showed me a simple 1/2 guard pass, that In my 24 years of BJJ, I had never seen. That's not shocking, but what was kinda surprising to me was when he said, "That used to be THE most popular half Guard Pass. That's the one everyone used to use. No ones uses it anymore."
I said, "Why not?"
He said, "I don't know" Then he moved on.
Most of us practitioners don't really have much perspective on BJJ. I'm quite curious about the stuff that has come and gone, had it's heyday, that we don't even know about.
[I know someone will ask so, the 1/2 guard pass is: Your RIGHT leg is trapped in your opponent's Half Guard. / Attack your opponent's neck with an amassa pao(?)/ Thrusting choke so that your LEFT hand is punching the ground by the LEFT side of you opponent's neck. / Right hand grabs a fistful of belt over your opponent's LEFT hip. / With all your weight on your fists, POP UP TO A SQUAT POSITION. / Do a basic knee Cut to Pass. ]