Unlike Mrs. Bennet, who is obsessed with marrying her daughters at all cost, and often acts irrationally and impulsively, Mrs. Gardiner is a woman who can best be described as prudent. She is kindhearted, sensitive, and well-mannered, and a discreet confidant of the Bennet sisters. She listens to them, treat them with affection, and gives them sensible advice.
Jonas was skipped over because he was not assigned. He was selected. His assignment is so rare that only one child was chosen to it. In fact, only one child is chosen to it in decades.