The book was published in 1983, written in the years leading up to that time (late 1970's/early 80's). I'm guessing a lot of what he wrote had to be filtered to of course try to wash his hands of the heroin epidemic he and Galante helped facilitate, but also to probably avoid any type of subpoena or possible charges relating to Galante (pre/post mortem). There was no benefit to him telling his story with Galante as a character, even though it's a huge, gaping hole. I think mentioning such a current player like Galante, the way he was taken out, and the investigation following, Bonanno was probably advised just to leave him out of the story by his legal representatives, just guessing though.