It’s too late for Biden to get in...
What is your basis for that?
Remember, a party convention is like the electoral college for the party. If Obama manages to get her thighness indicted a week before the convention, what are those delegates going to do? One possibility is, the party will do a bait and switch in a smoke-filled back room, appeal to party unity, and put Biden forward at the convention itself, even though he was never on a single ballot.