Silla will never be DB, but only because Silla does not work like normal gangs you have been in.
Let's be real, no one's gonna be DB without access to Staff GPS and a hot crew of bastards like @TheKoreanNation and @Saltbut they got kids and shit now, at least in TKN's case.
Silla are a gang of individuals, they don't roll as one unit 24/7. Even though most people have had a toxic interaction with a Silla member does not mean Silla hates you, as far as I can tell. It doesn't even look like they coordinate for much aside from conquests/WZ.
Personally, when I find a Silla member outside of Kavala they're always 5th wheeling with another gang doing runs, so it is a lot like 2016 DB in the way that they really focus on a solid grasp of their slice of the map and rarely go past coke-pro, and most of their members don't need to do runs necessarily. Everyone has seen Tammy on the top 10's of stats. So technically Silla is like a post-grind rich person Gang, once again similar to how DB was.
The only reason they aren't DB is because they splinter when they leave Kavala, they don't fly a fleet of Orca's into mush pro or anywhere to drop on people. But if they did, people would rage because imagine having to tell your gang members you got robbed alone by two full orca's of Silla members, shit would be hilarious.
You either have insane coordination, or insane numbers, and Silla definitely chose the latter. Not everyone is DB, Tree, Noble, or Woo.
At least with CTF, WXM and now Fury and 141 if you rob one of them you know the others on the server are on their way. Not always the case with Silla.
Also why is no one talking about The Man The Myth The Gambling Addicts in Kav? Those guys are 10/10 funny asf.