Zero chance this POS dug a 12ft trench by himself to bury these guys. Someone else is going down and I don’t think one of the dead was in on it as far as murder, maybe a rip off. So who helped with the grave? Parents one way or another have blood on their hands.
Maybe with a back hoe? The business probably used them.
If he had access to a backhoe, it is quite possible for him to have dug such a hole by himself. In fact, I see it as the only way possible he could have dug such a hole.
The guy looks fat to me. He doesn't looks like he has the stamina to dig a 4 foot hole, let alone a 12 foot hole.