No no no, Fourumvirate flows much better, PR man, PR!
Clearly, they were originally
The Fantastic Four but trademarks and copyrights, man.
Also, no, Hero, we're not going with The Foursome.
I think they weren't Quadrumvirate but The Founders, when Hero died they changed the name to Triumvirate because they ceased to be ALL the Protectorate's founders.
And I don't think they could be "The Founders" in the time
before the Protectorate was officially established, hence "Quadrumvirate," that's all.
Here's the thing that kinda bothers me: It's hinted in either the previous chapter or the one before it that the local Protectorate tried to call in reinforcements and no matter who they called: Lung still beat them.
Now keep in mind, I love this story and whatever comes of this discussion won't effect my future reading, I just want opinions and thoughts.
Back to topic: To me that sounds off. Like in my own headcanon, Lung only survived because the Cauldron's Experiment in Brockton Bay backfired on the PRT/Protectorate's Capability to respond. It's the only way I can see the Triumverate not coming down and squashing him to in a show of force, to make sure a second Lung doesn't happen, or if not the Triumvirate, a Team dedicated to dealing with extreme heavy hitters. Either that, or he's an explicit PtV plant, and Contessa is using her connection to Cauldron to keep him untouched.
So just to make it more clear why Lung is like this in STA, this is what Canon Taylor thought of Lung during her First Night Out:
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He went by 'Lung', had successfully gone toe to toe with whole teams of heroes and had managed to keep himself out of jail, as evidenced by his presence here.
So there was definitely an impression that Lung could take on the whole of the Brockton Bay's Protectorate and come out on top. Though, this admittedly also runs at odd with how Taylor gets
surprised that Lung wasn't considered an A-Lister, which seems like really early installment weirdness.
Anyways, canonically, Brockton Bay wasn't the first place Lung came to when he arrived to America. He appeared somewhere else and started his career of beating up heroes and villains alike while creating the ABB (and recruiting Oni Lee), all
before he settled down in Brockton Bay.
So it's my presumption that Lung should in-universe have a big reputation of punking the PROT as he went eastward, so the BB-PROT failing to beat Lung was just the latest but expected failure (so this would be egg on the whole of the PROT's face, rather than just BB-PROT). That said, since Lung was fighting on the go, he probably never exhibited a great deal of his powers, so when he decided to stake his claims in BB, the local PROT was absolutely not prepared for how far he could actually ramp-up (and Lung beating him is probably that one huge blemish on Armsmaster's near-perfect record).
Now, when it looked like Lung was settling down in Brockton Bay, the PROT couldn't just let this insult to their credibility go, so they start sending reinforcements. Unfortunately, this didn't exactly work out well. In most likelihood, Lung didn't outright beat all the reinforcements but he didn't lose to them either. And, really, there was no need for Lung to do everything by himself -- so it wasn't just Lung the PROT had to deal with now but also Oni Lee, Dokkaebi, Jiangshi, etc. Meanwhile, the E88 were naturally taking advantage of the situation while the PROT were focusing on the ABB. Eventually, the escalating damage to the city had the PROT and residents going "Well shit, is there going to be a city if we keep this up?" and they just gave up on trying to uproot him.
Now, on meta-Knowledge side of things, yeah, it's probably Cauldron shenanigans keeping Lung in place. Like, even without Contessa's guiding hand, the Triumvirate (or heads of the Protectorate) did try to recruit Lung after his fight against Leviathan in Kyushu -- but he turned them away each time, so the group already knew that he was a useful asset against the Endbringers and maybe Scion, and decided to keep him in play (like how they apparently let Grey Boy run wild with the S9 until they decided it wasn't worth it anymore).