Isn't one of the rules for the Crips and other gangs "Blood In Blood Out"? Therefore Tookie would have had to have been killed by a fellow Crip to officially be out of the Crips, proof that he was still bangin' while on Death Row. That and he looked pretty damned healthy so I'm sure he was getting favors while in prison and that would indicate he still had relations with his gang since thats one of the first survival rules in the clink is to affiliate yourself with a gang. So even if he tried to make joining gangs in the free world sound bad he still remained loyal to his while in Prison which is what I think keeps most gangs going is the thought that:
"Hey I'm probably going to end up in Prison so I'd better just get with a set while on the outside so when I do end up inside I don't have to worry about whos gonna have my back."
"Hey I'm probably going to end up in Prison so I'd better just get with a set while on the outside so when I do end up inside I don't have to worry about whos gonna have my back."