Well, no one now. He could have pardoned himself on the way out the door, and at least that would have protected him from Smith, at least on the DC charges and perhaps even the Florida charges. That would have been the smart thing to do. Naturally, Clueless Don didn't think the obvious thing to do would be necessary.
He’s now facing charges that go beyond the scope of 1/6/21, so a pardon wouldn’t have helped unless he was Carnac the Magnificent.