I'm sure given the circumstances everyone here will say they would do the right thing and call 911. I doubt I will find anyone willing to admit they would bury a body if they found one in their house.
My post wasn't directed to ask what someone here on the forum would do if they were in the situation, it was asking if they agree someone is more likely to try and cover up a murder if that person didn't know if they were responsible for that murder.
Let me put it another way.
I'm sure most people know what it is to blackout memory from over consuming alcohol. IIRC it's been mentioned here on the Savannah's thread recently. There is probably a technical term for this, but I'm not going to go look it up unless someone really wants me to. If you don't know what blacking out is, it is when someone can't remember what they did after becoming highly intoxicated. The person doesn't need to pass out or go unconscious for this to happen. Some people go to bed and wake up and don't remember parts and pieces of what they did the night before.
If DS blacked out some or all of his memory from the night before (early morning) and woke up to find Savannah dead in his house, he could have thought he killed her and therefor buried her body to cover up what he thought he may have been responsible for.
Given this set of circumstances I can see how someone that was innocent of any wrong doing thinking they would get themselves into a trouble if they called 911 to report a body in their house. (Remember in this scenario he doesn't know if he killed her or not) Yes the right thing would be to call 911, but maybe DS didn't want to put himself in the lime light with having to explain how a women was found dead in his house and then to find out he was also responsible for her death once that is determined.
I'm just trying to come up with an explanation as to why someone would bury a body if they didn't perhaps cause that person's death.