I think I know the answer, but just to be sure. The question came up last night.
"While Theon Greyjoy is in your dead pile, he gains: "At the beginning of the dominance phase, discard the top card of each opponent's deck.
Response: After a unique character is discarded from the top of an opponent's deck, put Theon Greyjoy into play from your dead pile" "
If a unique character is discarded in this way at the start of Dominance, does Theon come into play before Dominance power is awarded?