Nicky to answer the original question the point of Ray being a captain is old man DiMeo made him a captain when he expanded the family in 1960. He got crew in 1960 for being an earner despite being the only ever member of his crew so they indicate. Same thing with Larry Boy, again when the DiMeo family was expanding in the 80s. They were adding crews and at the time the top earners were Larry Barese with garbage hauling and Jimmy Altieri with prostitution, who each received their own crews. However Larry Boy's only member is his nephew Albert and only associate is his top earner, drug dealer Rusty Irish.

Here's a link with full details on the Barese Crew and all other crews as well

http://sopranos.wikia.com/wiki/Barese_Crew