This is a FBI report explaining the chain of command in LCN.
Note that no boss of bosses is mentioned and it also states "The Commissione is the ultimate and final authority in this organisation."

https://www.maryferrell.org/mffweb/archive/viewer/showDoc.do?docId=94909&relPageId=6

In here, note the words "each boss of a group or a family enjoys the same prestige as all other bosses throughout the country, despite the fact that certain families might be much larger and much more powerful than others."

https://www.maryferrell.org/mffweb/archive/viewer/showDoc.do?mode=searchResult&absPageId=981000

In the early 1960s, while Bonanno served as the chairman of the Commission, Bonanno´s proposal of dismantling the LA Family and to send his guys to LA to take over was rejected by the Commission members. Just to prove my point that the chairman of the Commission was never regarded as the boss of bosses, read this part

https://www.maryferrell.org/mffweb/archive/viewer/showDoc.do?mode=searchResult&absPageId=981004

Here is a small part of Valachi´s account in regards to the transition of power from the boss of bosses to the Commission

https://www.maryferrell.org/mffweb/archive/viewer/showDoc.do?mode=searchResult&absPageId=980885

Here is an informant saying that there hasn´t been a boss of bosses since Lucky Luciano became boss

https://www.maryferrell.org/mffweb/archive/viewer/showDoc.do?mode=searchResult&absPageId=1401951

There are multiple reports that can be found on the MFF site saying the same. I honestly can go on and on.

As of the votes on the Commission. They all counted the same. No matter how powerful a boss was or how many soldiers he had under his command, his vote still counted the same. Check out Bill Bonanno´s last book. He goes into great detail of the functions, protocol and the proceedings of the Commission. Extremely interesting. If you are interested, pick up the book.