A young street level dealer must navigate the mine field of gang culture to get out before the gang implodes in a bloody internal war.

I think this concept is pretty good - it seems like a unique take on the gang story to have someone try to navigate gang politics to get out without giving the other members cause for offense or concern.

If he leaves they will kill him. He think he knows what is coming and he can't leave his brother to what he believes is death.

Higher stakes if the reason for him to get out is because his life is in jeopardy, not just his brother's.

Their a number of members being killed. Everyone knows it is member on member. He witnesses the bosses son kill the bosses friend. The boss doesn't know who did it and puts out a reward. Running appears to be his only option, but he needs to save his brother. If he runs, they'll blame his brother, he thinks.

What's the inciting incident that triggers his decision to get out? "Get out before the gang implodes" is anticipating trouble -- reacting to what he fears will happens. It's not a reaction to a specific event in the present tense, something that happens that motivates his decision.

What is the specific event, the inciting incident?

No chance to disappear. Think mafia, leaving is disloyal. Plus why leave, you going to the cops? Death unless you're 100%. There is a power struggle. The gang has grown and is splintering.

He is scared and knows he will not survive. He is tough enough to sell drugs. But knows in the coming fight he'll be asked to do stuff. He knows he'll fail.

Why are there killings? Can't he dropout of the gang without anyone noticing?

There is a blood-in blood-out culture to this drug gang. No one leaves unless they are dead. There has been killings. Member on member, war is coming. He wants to run. He is around 17, he has a brother who is not that smart and a few years older.

Why must he navigate the mine field of gang culture? Does he have a larger purpose then escape?