What do Milo and Alex suspect is Dwight and Heather's involvement in Jamey's current mental state?

Milo and Alex suspect Dwight and Heather have a significant role in the problems with Jamey's current mental state. They believe that Dwight and Heather are poisoning Jamey. They also believe they are doing this in order to remove Jamey and Digby so nobody discovers the potential problems with the Bitter Canyon deal that many have invested in and could potentially cause Dwight to lose money if anyone found out.