This is the first mention of Dr. Sheehan since his appearance in the prologue. The prologue heavily implies that Dr. Sheehan knew Teddy, so presumably they will meet at some point in the narrative. However, assuming Dr. Cawley is telling the truth about Dr. Sheehan’s departure—and that is a big assumption—then it is not clear how that is possible. Again, the official narrative Dr. Cawley and his team tell Chuck and Teddy fails to add up.