Cronus's words were no assurance, but they were minutely better than the clear rebuttal instants before. "I am not your wife and I don't have her wisdom, but I see reason in following you, as she does.
"I cannot lie, uncle. I wouldn't be here if I was interested in serving your son. The kingdoms are gone, but kings and subjects live on. Your children, my children, my husband. All make their choices, yet sometimes they change their mind. They can break oaths and deal with the consequences. But I cannot, not while the oath itself endures." That oath was gone, now, and with new-found freedom to choose, Styx had shrugged off the old bond.
"I don't expect a pardon for my actions, but I could prove my mettle to you. And consider - if Zeus's fiercest supporter among the lesser gods abandons him, what will that do to his ranks?"