Jean
I understand that in certain years there were a lot of swords that passed Juyo, others there were few that passed. The standards seem to change. At the beginning it was hard to pass, then in the late 70's -1980's-90's there were a lot that passed each year, then in recent years it has tightened up again and fewer pass. If you know that then it makes sense that a blade that passed when it was standards were "loose" might not pass now. So if I see a sword for sale that passed in a year when things were "tight" I would not give it a second thought, but if it passed in a year when there were a lot of swords passed then I would give the sword a second look and pay more attention to the sword understanding that there were great swords that passed that year but maybe some lower quality ones made it as well. The number that passed each year is in the Juyo Zufu for that year so if you have a set of the zufu, or access to them, you can make a quick list of the number that passed each year. I do not have such a list but would like to have the numbers if anyone has it. I just keep in mine the dates and figure it that way. If you can tell the quality of a sword then it is not so important, but if you are a dealer, or are unsure then some background helps. I figure great swords make it each year, so there are great swords in each group, it just varies how many lesser swords made it as well.
The old adage -- "buy the sword not the paper" applies