well, that was the reviewer consensus - I can't cite chapter and verse, but The Big Gundown was the recording which seemed to move Zorn front and center (internationally as well; he was/is a bona fide new music star and one of the few who've gotten rich in the process). The downtown thing was significant - centered around the Knitting Factory and, though based there, was not really NY-centric. Impacted a lot of musicians, including myself. It put the last nail in the coffin of my bebop-centricism. Not only Zorn, but Byron, Joe McPhee, Brandon Ross, Robin Holcomb/Wayne Horvitz, Ben Goldberg, even Frisell, as I recall (this was a long time ago); even Braxton was somehow, if artificially, appended to that whole era. Also, a lot of significant post-Punk non jazz things, Teenage Jesus, No New York, Mars, Lydia Lunch, Robert Quine. Arthur Russell. Also Ribot, Anthony Coleman. So it was, IMHO, as significant in its musical after-effects as AACM.
and actually I disagree re: Jetman and Zorn - Zorn is truly a World celebrity, not really attached to NYC anymore, a star attraction internationally and (at least he used to be) a resident of Japan.