I learned recently that gators are further up in GA than people realize, according to my sister who lives in Houston County, GA. Pretty creepy. I am not sure what this has to do with this case, though.
A few thoughts.
First of all, someone posted about taking the head and Mrs. Shirley as collateral. That makes some sense to me. Why, though? The motive presented by that poster (sorry, I can't give you credit since it is buried in the multitude of responses on the two threads this case has generated on this site) is to obtain a significant amount of money, or object worth a significant amount of money. With all the time gone by, even if that was the objective, it may have wound up an unworkable premise by the perp(s).
Second of all, it does not appear there is any official acknowledgement that this was a anger-sex based attack by a very disturbed individual. I know there were other elderly people attacks in a neighboring state, where the arrested POI does have ties to GA within the same timeframe. I still think this is an angle that should be pursued.
Thirdly, with one the sons saying he hopes his mom is dead so she doesn't have to be cooped up with any type of madman(men), I am worried.
Anyway, I appreciate all you caring sleuthers out there. I usually only visit this site when it covers a story near me, so that is why I am here. The Internet makes all kinds of information available that never was before. Can you believe you can easily access a Brittish tabloid to read information about this case? (That is for the old timers, of course!) Because you are interested and care, I think your work really does help with the mountain of information LE has to go through to solve a crime. I think web sleuthers helped with the BTK case too, when this type of investigation was young, so keep going.