Of course, they all understood that the Four Major Clans would follow suit and surrender their position and authority to the Crystalforge Clan. It was apparent they couldn't handle this situation themselves, or else they would have done so already.
However, upon hearing the Gemheart Clan Mistress relinquishing everything they owned, even with Orion stating that he would deal with them, and sensing a hidden intent, it wasn't hard for them to speculate the kind of judgment the Gemheart Clan was about to face. Despite this, they found it somewhat challenging to believe that the Gemheart Clan Mistress would willingly swallow her pride and utter such a sentence without hesitation.
They wouldn't doubt her reasons if they were aware of the punishment the Gemheart Clan Mistress had endured under the Gemheart Clan Head. However, since she managed to conceal her scars whenever she left the Castle to avoid arousing suspicion, it was understandable that they couldn't.