GM, artie!
Your post is a good read for another potential scenario.
The question that I can't get past (in my own mind) tho is why would a killer choose a very risky timeframe to enter the home & commit the murders. Why wouldn't the killer wait until CC was at work @ his nite job - when the possibility exists that CC would be away from home for hours before returning?
From the timeframe we know, there was only about an hour between the time CC left to goto Gold's & when the phone call to "police" was made & the bodies discovered.
Even an attempt to frame CC wouldn't necessarily require an early a.m. slaughter of the family while CC was working out at the gym, right? I mean, if the family was murdered within minutes of CC leaving the home (assuming this is what TOD will indicate), wouldn't that also apply if done while CC was working his 3rd shift job?
Hope this makes sense...still working on my 1st cuppa joe.