Yes. That's what I wanted to explain more, it's a graduation structure per say.
The longer your a member than the further your title becomes. Think of it as a guild; apprentice, journeyman, etc. but it's Yg, G, Og. But it vary from set to set and some are structured differently.

Crips/Bloods have been involved in PCP trafficking since the 70s and most people overlook that era. Everybody knows the 80s crack wars but before then most of these gangs were involved in other activities. Some already existed before the umbrella groups formed.