After watching each episode many times I finally realized that once Marty arrives he pushes everyone to the edge of what they want. Marty pushes Drew to need Sherry and for Kafl to leave. He is quite evil in his ways till he softens around Merrill. In Lost Weekend when his hunger comes on he is back to himself. Perhaps he was fury, caught by the elders and given a chance. Not given time enough to understand who might be in the experiment, but thinking that they would be just like himself.