I threw Jarrett in as a joke; she’d never run for elected office. You opened up another dimension of Joe’s dilemma. Biden’s closest handlers will not tolerate a running mate who is ready to be POTUS on day one, yet that is what the voters will require.
I think the Dems expect to lose, making his VP pick a “burner”, useful only for drawing minority voters to help their down-ticket races. Stacy Abrams might motivate black voters, and she would enjoy the exposure even in a defeat. She is radical enough to please some Bernistas, and is utterly shameless. Your Jill Biden angle might knock her out of contention, otherwise she’s their best hope of losing successfully.
I took it as such...as a model/type of Veep that would basically management Biden.