Pete, I imagine that most of his time was spent in Europe. Since only the Tattaglia's and Barzini seem to know of him, he probably was low profile. Also, I take it that many Dons frowned on the drug traffic just as Vito did and that contributed to his low profile. Since Barzini had some control in the Bronx, I imagine that Sollozzo met with him or his people at Louis's a few times
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."
