Brazillian Jiu Jitsu: Why would you NOT want to learn other techniques?

For some reason, the BJJ camps ban judo and small circle jiu jitsu before blue belt level. When I took Isshinryu Okinawan karate and Japanese Jiu Jitsu, the first thing they teach you in your first submissions class is the most basic wrist locks, ankle locks, and finger locks along with rear naked choke, cross arm breaker, full arm bar, reverse arm bar. I think those are all taught on your first day of submissions as a YELLOW BELT.

For some reason, the BJJ guys do not want you teaching any of these moves to anyone less than blue belt. I was like, "I'm a Black Belt Candidate in another Jiu jitsu style, and you can't tell me what not to teach somebody when I want to teach them."

i mean seriously, I know over 200 unique submissions, about 3/4ths of them are applied from standing position, before you even get on the ground.

My chief instructor's credentials (then and / now).

then/now

4th degree black Isshinryu / 7th degree

2nd degree black shotokan

1st degree black in Gracie Jiu jitsu

max level Krav Maga.

Combat Judo (unknown level)

And he taught me literally everything he knew. The only reason I never got my black belt from him is because I had to quit for private/personal reasons during the freaking testing.

Anyway, why do BJJ specialists not want to learn any outside techniques?

The whole point of Isshinryu "karate" as a "style" is to study and absorb the best of EVERY style.

Brazillian Jiu Jitsu: Why would you NOT want to learn other techniques?
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