Balmafula was one of many, yes, but she had fallen in love with Delita, or had at least become infatuated with him. It says that she was unable to draw her sword when he attacks her. For him to do that to her and either attack her, or cut her tongue out, needlessly, it clearly shows that he had gone too far.

And I would assume that Delita and Ovelia's scene wasn't years upon years later, otherwise the sprites would have changed, or more information would be given. They don't have any problem changing sprites or using sprites for one story scene, such as the modified Alma for Ajora, or even his portrait. Instead, he's just wearing a cape, right? King Delita and Queen Ovelia are their names used in the ending, so I assume it was just a year later or a bit after the marriage. Any farther on that would extend into the reach of "long and peaceful rule" would have had sprite changes to reflect that.