The title "boss of bosses" is mostly potrayed by the media in the past(even now) with articles like"They killed Galante,Boss of Bosses"...but yet theres always the most powerful,supreme crime boss on the table(even if its only for a short time)
The funniest thing about the media saying that is Galante wasn't the most powerful boss the other families didn't even recognize him as boss but of course attaching boss of bosses to his name makes it seem much more important .
