I think Odessa qualifies as she is a kindred soul for McDohl. She knows him the shortest amount of time of the four, and yet she has as much influence on him as any of the others, inspiring him to become a major force for the liberation army.
Personally, I wouldn't think the inner circle would know much about it. There may be suspicions mind you, but it's never stated by anyone and that's kind of a major thing to over look. How would McDohl even breach that subject? "Um, hey guys, try not to stand too close to me in battle so I don't, you know, eatyoursoulsorsomething. Good luck!" As for the spells, we as the player know why he gains new spells by the game mechanic. But would those in game know this? I mean, McDohl gains a new spell for his father's death, but you could go the whole game and never cast said spell.
No matter which way you look at it, the scene of Ted's death is a major opportunity for the characters to talk about it... and they don't acknowledge it even a little. They just grab the weed/plant thing, and head home like that wasn't a big deal. Considering how Flik reacts to Sanchez's involvement in Odessa's death, you'd think he'd have some choice words for McDohl over this subject. Yet we see nothing. Is that odd, or am I just being nit picky?