It's not really a question if there were non-FBA blacks, present, it's more of a correcting of myths that have been going on since the 1980s. The "Herc started HipHop from Jamaican roots" is false even by Herc's own admission.
Herc has said countless times that HipHop was already going in before he was even a dj circa 1970 via Dj John Brown at the Plaza Disco and the Tunnel. Read below
The hip-hop pioneer takes DJ History around his old stomping grounds in this archival interview.
daily.redbullmusicacademy.com
Dj John Brown seen here
is who Herc got his early playlist (funk aka breaks) from and the idea to play them for what would become bboys
.
.
A1-BBoy Sasa confirmed this (Graf artist Phase 2 also spoke on it before)
.
.
To sum all that up
.
.
.
.
.
a lot of the myths got more cemented with that 90s Source issue with Herc, Baam and Flash on it
.
.
Most people aren't aware that Dj Smokey predated Herc (1972) in Herc's own area in the West Bronx......
before Flash was a Dj, he was crate/record carrier for Smokey!
Smokey had the first bboy crew
.
.
most of the bboys were at his Jams prior to going to Herc's
.
.
Pow Wow from Zulu Kings/Zulu Nation on Smokey
.
.
.
Both, Smokey and Herc were directly influenced by Dj John Brown
.
.
.
.
Smokey also said HipHop didn't start in 1973, it started in 1970!