Apologies, I was slightly incorrect in what I said previously. GW describes Leaders/Champions/Juves as 'central to a gang's narrative', while Gangers are its 'supporting cast' which is why Gangers progress via random means and all the other progress via choice.
This previously made sense as you needed ~50% of your gang to be Gangers, they really were the great unwashed of your gang. But now since both Juves and Prospects count towards the "Gang Fighter" count, and I've seen plenty of decent gangs without any Gangers at all, using Juves/Prospects to pull up the numbers, the theme has got muddled.
I’m not sure it really matters that juves fall into the same category as leaders and champions or not. The difference between having 3 lead actors and 5-6 lead actors in a show is fairly similar in that it doesn’t work very well.
What works much better in a narrative sense for a group of less than 10 people is to have an ensemble cast with each character having their own storyline that intertwined with the others.
It’s the reason why soap operas actually work as a format because all the characters are treated mostly equally along the entire narrative course. They ebb and flow but all get their time in the sun.
If you compare it to successful tv shows with 3-4 main characters (Seinfeld, HIMYM, even Friends) you will see that while the story works for the main characters but fails for recurring support actors and it would be a bit wierd if Newman turned up in every single episode as a main plot driver. This is the problem that Necromunda has in that Newman will always be there, and he will always be part of the story so the story should include him.