Possible fued between Sollecito and Scoppa? Always intriguing to speculate, but perhaps it's much less interesting and it's all about an unpaid debt. I may misremember, but I thought Salvatore was in trouble with street gangs. There was a price on his head before this war started.
Anyway, with Andrew incarcerated his brother probably has to step up, if he hadn't already.
His last known conflict was with the Arcadi crew.
Still unclear where he stands, seems like with Sollecito. Even more unclear, who stands with Arcadi?
"It was between the brothers Kay -- I had nothing to do with it."