From Yukihiro's point of view, a little probing would only leave him with a bad taste in his mouth at this point.
Yoshitaka would definitely use the Mitsui Group's influence to harass the Yamaguchis in every way, framing it as a campaign against mob violence or even reviving cold cases.
It would definitely inflict a lot of losses on the Yamaguchis, if not outright deny them a year's worth of income.
Even if they were seething, they wouldn't self-destruct to bring the Mitsuis down, and might even take the insult lying down.
However, if they really had to make enemies of Yoshitaka, Yukihiro knew he had nothing to lose.
The Mitsuis were the top dogs of Japan, but they did not own the country. Even if they had the money, the Yamaguchis had guns. If they wanted a fight, they had it.
And when physical violence was brought to the table, it was Yoshitaka who would have a problem.
At this point, Yukihiro was not giving up on the one billion.
It was either paying him the same amount or a