My theory. Biden will resign, Kamala will name Hillary VP and then Kamala steps down.
Hillary was ill while she was campaigning against Trump; several videos of her stumbling, falling up the stairs, bobbling her head, she was late for interviews and rallies. She's now 4 years older and I doubt she's well enough to take on the presidency. She didn't even bother to put her name in the arena of candidates this past election.
Kamela's VP IMO will be very telling and the real person in charge. My guesses; Jarret, Rice or Obama (Michael).
Where in the hell is the call from EVERY GOP for Joe to step down? That in itself is troubling.