Joe Bravo wasn't just some "spanish guy killed because of drugs". He came up around mob guys and Rizzuto brought him into his organization as basically one of his own. And he always treated him as such, until the end, according to Humphreys, Bravo was killed because he was playing both sides of the fence during a war. I know Humphreys isn't the end all be all, but he's been on point before, not much reason for me to doubt him now. But it isn't just that, the wiretaps basically tell the same story.