Why would MR not be suspected? He was the last to see Dylan, the last person known is always a suspect until proven otherwise. My father was a homicide detective, this is how a case begins by looking at last known details. There is no other logical point to start. Suspicious to me was when one of MR's first comments was "My problem is my ex-wife...." . I'd have said " My baby is missing...anyone, everyone help me!"