Great stuff, wit, as always.
The ‘Agnes’ horses are bred by a wide range of different people in Japan, although it could be that they are all involved in the Shadai partnerships.
Something to back up your idea though – the earliest naming of an Agnes I can find in Japan is a 1971 horse (even though Shadai was founded in 1949), who would probably have been named as a 2yo in 1973.  The number of Agneses (Agnei?) rapidly increased in the late seventies, in line with the events you mentioned. ÂÂÂ
Another Japanese one that’s been bugging me – can you explain about the ‘Symboli’ horses?