The AG will listen to the party leadership. Especially if he wants to move up the ladder. Evidence "won't be sufficient".It may not be up to Biden. As long as Barr is gone all bets are off. Southern district of New York can fuck him up. Or some other AGs.
He is a conman and fraudster and all his life he’s been trying to defeat the ends of justice and prosecutors hate his kind.
Because if they do it it opens the floidgates to every aspiring GOP DA to go after local Dems. Right now there is a polite truce in the two parties to only throw those (like a Weiner) out of favor under the bus.
Go after Trump and the truce will fall.