Thaddeus. The Previte been discussed ad nauseam (not insulting you just saying) on this board.
Ill tell you my thoughts, from what I have discerned from my research.
If you read the "Last Gangster" by George Anastasia. YOu will see from wire tap convos that he was in fact considered a made guy. He is spoken too by other made guys like John Ciancaglini, Joey Merlino, and Ralph natale as being another wise guy and is spoken to in accordance with mob protocol. \
References by other members as "this thing" and "friend of ours."

He was actually elevated to Captain, however, his status as captain may be debatable because he didn't have any made guys under him.

Moreover, if you look up articles from the 1990's on google (before he was outted) you will see that he was reputed (at least by the media) as being a wise guy and captain who ran south jersey operations for merlino and natale.
Finally, in the book, it talks about how a bunch of made guys from the new York families came to his daughters wedding. That's not something they usually do for a two bit associate.