My opinion is that Luciano had to get respect in Italy, for three reasons.

One was heroin, and lots of it. Supposedly Lucky was a key player.

Two was he was said to have inspired the formation of the Italian Commission, or the Cupola, just as he formed the Commission in the States by whacking the top Boss and then decreeing that neither he, and no one else, would be a Boss of Bosses.

Three was that Italian talk in the street described Luciano was Capo di Tutti Capi. So to everyday folk, Lucky was the Godfather of Godfathers. In a way I agree, since by aligning yourself with Luciano at that time, you as a Boss received the umbrella of protection from the majority and the majority leader.