"You mean you were less restless after you killed me? That's great. Glad I could help."

He and his father had forged something like a bond, and Daniel was getting used to the idea of finally having that father he always wondered about, but now with this new information, he's finding it difficult, or confusing, or both. While he still has positive feelings for Gale, the part of him that remembers being Kevin remembers the anger and the resignation. And maybe Kevin was okay with it, but Daniel still has the strength to be angry on his behalf.