That's a very true quote, the discipline isn't there, it's why these gangs are so unstable, not just here but look at the Camorra in Italy (to me these are just really organized urban drug gangs, there are exceptions of course, Licciardi, Casalesi, Nuvolettas etc)

But there is a difference between a gangbanging gang, and a drug gang.
A well organized drug gang is pretty similar to a mafia crew, that's why if they come into contact with one, and it's reasonably organized, business will be done..
It's the difference in Chi in the 90s and now, they gangbanged harder in the 90s, but it was a business too, now it's all gangbanging...
But, I mean it's all relative, take two high level, high volume drug dealing cartel connected brothers, the Flenorys (black) the Flores brothers (Mexican), the Flores brothers are the ones that cooperated, Ironic right?