It's a self induced belief. Just like the other poster saying that Salvatore Maranzano was the one and only Boss of Bossses. Also, he doesn't have proof that Maranzano was the one and only in that position. The older mob history is more hazy then todays, so who really knows what happened.

We all go by what we read.

Also a self belief was the poster who created those mob charts. He placed Vincent Asaro as captain and Vincent Badalamenti as acting boss. My belief is that Asaro, Badalamenti and Vito Grimaldi are candidates, with all three possibly running the Bonanno family until one is chosen.