Under the crowd's surprise and scrutiny, Dyon showed no fluctuations in his emotions.
The reason he was confident enough to do this was simple, really. The garbage he spewed about checking whether or not the guilds ran on traditions or rules was nonsense. Whether or not they did was irrelevant. If the major families wanted to find issue with him taking over their guilds as a human, they would find issue.
Even if they hadn't set a rule, they would. Even if they normally wouldn't care, they would. A major family Dyon despised had just annihilated an orphanage just because of him. And although Dyon couldn't be sure of exactly which family it was as of now, he had some pretty foolproof guesses.
In other words, if they were willing to do what they did to kids and a sweet old lady, simply to try and hurt Dyon… what do you think they would do if he took over 2, or even all 3, of their most important businesses?