The Pung's, Grandes and Testa all had fathers in LCN. Salvie didn't bring those kids around; their fathers did. He was friends with alot of them because of their fathers relationships.
Only reason why Bruno had an audience with Gambino is because they personally went back years and their families were "cousins" or some shit like that, from the old country. And, that move by Gambino to save Bruno, while it appears to make us believe that things like that can happen, was 100% self-serving. It gave Gambino another ally on the commission.
The Genovese were allied with Scarfo. He did everything they asked of him and they sided with him. If testa went up there, he would be dead. No questions asked. And if you think Testa could have appealed to Big Paul, the other heavyweight at the time, that's not happening either. Scarfo also met with Castellano on multiple ocassions. The scarfo/Gambino connection is very well documented. let's not forget who killed Johnny Keys Simone.
King has a point about Nardi & Danny Greene though. Pretty sure Nardi wasn't even made, Danny Greene literally had a handful of guys who killed for him, very few of them were LCN affiliated and was a virtual nobody in the world of OC, but his partnership with Nardi and fearlessness preserved his life for a bit and excelled him further into the underworld than he probably should've ever been. Yet he gets a sit down with Fat Tony Salerno, the front boss of the Genovese, same guy who also sat with Chin g Funzi Tieri during the Caponigro meeting. Technically if they can meet with someone that close to a boss, I don't see why a high ranking, high earning capo from Philadelphia wouldn't be able to. I highly doubt he would've gotten an okay to clip Scarfo nor did I ever imply he'd be taking over any family. But I also doubt they'd tell him basically not to defend himself. Which is the whole point I was getting at before, from all accounts Salvie Testa was prepared to kill for his life, just as much as any other man would be.
Scarfo made mostly younger guys, and mostly all of those guys grew up with Salvie Testa, Grande, Leonetti, Scarfo Jr, the Pungitore's, etc. And not all of those guys were as close to Nicky as Salvie was, and in fact, Salvie brought in most of those guys into the Scarfo circle. So either way, killing Salvie was Scarfo's downfall, because young guys and the very few old guys Scarfo made and kept around from the Bruno days, saw it as, "if he'd kill him, we're all expendable".
