This seems like a pretty decent hedge on the outcome of the election to me. If it a strong case and they win, Barr can take credit if Trump stays in office or if Biden wins and cleans house.

If they lose the case and Trump is re-elected, Barr can lick his wounds and try again in a year or so with a stronger case.

If they lose the case and Biden cleans house, he can blame the Biden administration for dropping the ball.