There's a few really good Maynard records from that time, the MF Horn series. Great band, great energy, and charts that didn't back down from the challenge of having an audience-facing repertoire. But that stopped. Boo.
Poor Don Ellis, never could make up his mind...but there are some really good Don Ellis records. Goofy, but seriously good records.
No idea what they got rid of in Minneapolis, but my hunch is that the people who got rid of the records had no idea of what they were buying to begin with. So often, that's how it goes