I don’t know. That could be anyone. All the characters could fall into a character that is returning in a different way.
We know with 100% sure of at least 3 characters that won`t be: Jefferson, Neal and Graham, i could say more characters, but with all the recast and since the others i could say are minor characters, they can return in a different way, just by being played by another actor/actress.
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"I offended you with my opinion? Ha, you should hear the ones I keep to myself".