AE and RWB mentioned a lot of things that were nothing to do with the murders, they were just brainstorming.
It certainly looked bad on EP that outsiders were doing the investigations for them. The end result being that it was the family who'd set out to convict him,nobody else. It couldn't be more obvious.
How many people here would go out of their way in seeing a " hated " family member who meant nothing to you, being put away under false pretences in order to receive a fortune for the rest of your life ? Tempting,isn't it ?