Compared to Mexicans, yes, they are a minority, and again like I posted earlier, Black men don't do well taking orders from others and will only unify when absolutely necessary. I think when you take that into consideration along with the history of Cali prison gangs, it will provide a better understanding. La Eme really is the prototype of organized predatory behavior behind bars (along with graduating to having influence on the street) and everyone else followed suit out of necessity, hence the rise of the big four (EmE, AB, NF, BGF). La Eme's exploits behind bars and on the streets became so legendary that southern California Hispanic gangs both idolized and feared them which is a heck of a combination. Young Hispanics were essentially being conditioned as groupies with a select few graduating to the big time. The same can be said about whites and the AB, and to a lesser extent Northern Hispanics and NF. That's not to downplay the BGF in any way, but the thing about the BGF was they were born during the latter end of the Civil Rights era with early leadership from civil rights figures. The difference between them and the other three is their goals initially were more revolutionary than criminal. La Eme never pretended to be about the betterment of Southern Hispanics. Their founders started out with the premise of terrorizing and controlling other inmates. The AB likewise wasn't into White Pride, but rather was born out of the need to organize and protect white inmates, however, their relationship with La Eme allowed them to naturally progress into a predatory force themselves. That's what makes their history (foundation!) different from the BGF. La Eme was criminal from the jump. AB was criminal not that far from the jump.
The BGF on the other hand turned into a bipolar organization with one temperament focused on revolution, the other criminal in nature. The latter of which was a late development and caused a split. When that split happened I think two things also occurred. One being the CDC was removing hardcore prison gang members from general population. The other thing was the rise of B's and C's. So white inmates and Hispanic criminals were entering prison in awe of La Eme and the AB and willing to represent on their behalf out of fear and being groupies. B's and C's coming into the system didn't have the same adoration towards BGF members who were in isolation along with AB, Eme, and NF leaders/members. Then you have the natural rivalry between B's and C's which was further agitated during the crack era. On top of that you have internal divisions among the C's. That said, the Black car is so fragmented in the bing, that its impossible in the Cali system to ever get organized. Not to mention the Bay Area aspect of it all.