I do totally see it and understood Greta's explanation of stackjackson's rule (oof, what a chain!).
It makes much sense. But what I meant is that a very large chunk of the "Library LP" shares are not really library. They are just random musicians doing their thing and happen to be picked up by a label.
With more and more actual libraries being shared in the past, almost all new entries are extremely iffy.
For example, when I posted the Detective Conan soundtracks, it was just something "Non-Library" that fits what you could hear in, let's say, a FLOWER release from 1972.
Effectively, it was a soundtrack, so not library as it was a paid commission. I do get that, as told in the thread.
But if we are real, a real "library" release requires a catalogue or somet other "structure" where it's being promoted to be ready for licensing. In the end, a library is nothing but a catalogue of music to pick from by anyone. If it's NOT a library album but the composer is involved in any library label in the past - then it fits in the "Non-Library section", as you just explained on-point. And that is almost never the case with the recent shares of the past years even. I mean, there might be the odd share, but much of the stuff I got from here is just some random italo disco album with zero relation, yet it passed the test.