Sorry to say that I don't have any information which connects our families based on your post. However, my ROSSI lines may have come from Pontelandolfo, Campobasso and Pietragalla, Basilicata.
My mother's mother is Maria Assunta Rossi b. 1909 Waterbury, CT. Her parent's are Gennaro Rossi b 1887 Pietragalla, Potenza, Basilicata, Italia, and Maria Donat Giambrone b 1889 in Pietragalla or Molise (depending on which document is correct).
Maria's siblings are Concetta, Domenico, Joseph, Maria Incoranata, Anna Liglioe, Anna, and Rosina. Her father's siblings are Ezeichele, Alexandro, Giacomo, and a few others. Her father's father is Domenico, and he married Concetta Romano.
Maria's husband (b Waltonville, PA) John Longo's mother's father may have a brother Joseph. If so, then I believe that Joseph's wife Laurenza's sister is Virginia Seneca b 1892 Lancaster, PA who married Rocco Rossi b 1888 Benevento.
Rocco had at least 3 kids, Grace Marie, Guiseppe Rocco, and Matilda Virginia. Guiseppe had at least 5 kids, Joseph Rocco, Gloria, Joseph Rocco II, Virginia Ann, and Grace Ann.
I also have much more information that I can share. Feel free to e-mail me at firstname.lastname@example.org