If you ask Aiden what the Baron did to him, he won't answer.

No, he really wants to answer, but he can't. He doesn't remember anything about his captivity, and he doesn't remember being a monster. All he remembers is his childhood, when he and his younger sister were constantly subjected to experiments. He also remembers being a Pilgrim with Spike. He remembers Spike, and he blames himself for not being able to save him. That's all.

Aiden wouldn't say he was upset; he'd look at his hands in silence, as if it were their fault for making things happen, and then he'd be quiet for a long time.

He trusted Lydia, of course. He trusted Kyle, whom he considered a close friend. He often thought that if he went on missions with them more often, his presence would protect them. Perhaps, to some extent, this was true.