Salvie was young and Scarfo had him around because of not only his dad but the fact that salvie was obedient to scarfo and would of done anything scarfo told him to do. I dont think he ever should of been killed but then again, i wasnt there.
In essence, salvie was expendable. If salvie ever made a move against scarfo, new york would of killed salvie in minutes. Salvie might have been big in philly but new york would of clipped him in a second. They liked scarfo alot. Ny probably didnt know who salvie was. They could care less about some twenty something kid from philly.