Shou had been in contact with the FBI liaison for the Numbered giving him information about how the yakuza see the Italians and also some of the trading info that he had known before he told the mob to screw off. He may not approach them directly, but will use the arm of the family lawyer types to suggest a meeting and explain things with them.

And now that I am actually thinking and such, Shou can offer to act as a liaison between the FBI and the figurehead of the yakuza clans if they really need to know what is going on. Otherwise, there will probably be some stirings in the clans as they move in to clean up the contorted deals they had to make with the Italians while settling a few disputes that they weren't able to due to the same Italians. There might even be talk of a consolidation among the groups, especially if there is like a Mr. Chan type person around (mr. chan is a reference to a moon child person who basically took over all the various groups in order to keep trade and businesses to flow smoothly though in the movie, he was a bit of an a$$ about it and got killed by his own people. oops).