Yoshisawa is not forgotten and is still be folded. His butterfly is one of the models that I often see taught in early lessons. The diagrams are in FOCA's set of diagrams called first steps - not a box but a series of diagrams used as hand outs -many, many... years ago. Who can forget the Google doodle a few years back on Yoshizawa's Pi Day Birthday - designed by Robert Lang - and later used as the T shirt for the OUSA Convention. Yamaguchi always has a model in the front each origami Tantedain magazine. He has been showing up at the OUSA conventions consistently for many years. He always brings a number of young(ish) folders. He helped master mind the Origami section of TV Champions. He is not truly forgotten and unfolded. Toshie Takahama is mostly forgot - except for the misnomer: Toshie's Jewel created by Snobe... She had a number of books. Lillian and Alice Grey would teach her models frequently at Lillian's Origami Monday meetings. One of the first origami books that I had was All About Origami by Isao Honda. It was later republished as the World of Origami - after deleting the most interesting parts folds from equilateral triangles and diamonds. I later learned that he had a series of small origami books that appear to me to have been incorporated into the All About or World of... I have liked Lewis Simon and Bob Neale's work. They are not talked about much. I think that Lewis Simon's Angel is the best. Bob Neale had designed a 30 piece Dodecahedron - each piece was only 7 steps. Lewis designed a 12 piece cube that had some similarities to the Dodecahedron. I learned it from Lillian or Verdi first. I first saw the diagrams in one of Toshie Takahama's books. Louise Cooper, who I believed died recently, was a very prolific creative folder. She worked with the West Coast Origami Guild and the early days of FOCA. I seem to remember Michael Sander saying that he favored her Angel. George Jarschauer designed a paper airplane with a variation Boomerang Plane. I have only seen his name credit in to places: The original plane is credited to him in Stephen Weiss's Wings and Things as the Blackboard Bomber; and The Boomerang Plane is credited in diagrams drawn by Alice Grey as part of FOCA's First Step Collection. I am assuming that they were in the early NYC Origami Scene and would not credit the model without direct knowledge. I have seen the Blackboard Bomber described in a number of ways. My favorite title was the NOA's Plane with Navel - when I teach it to kids I tell them two names Blackboard Bomber and Plane with a Bellybutton. I instruct the kids to hold it by the bellybutton when throw it. I generally get a good laugh or a hearty grin at that. I believe that this is the same plane that held the Guinness Time aloft flight that I saw at a Hanger in York at the BOS 30th convention.
Trying to list all of the forgotten and unfolded creative folders seems to be an impossible task. These are just a few off the top of my head.