I mean, it could also well be just malicious incompetence covering, well...the regular kind of incompetence. If it turns out multiple cops were in and out of there during that time and all but tripped over a dead guy, that's not exactly a great look either.

It's plausible someone dumped him there thinking it was just an abandoned house and not realizing it was as active a location as it was. Or that the poor guy was ODing or something and his 'friend' tried to drop him back at his grandma's, then panicked and dumped him at the first secluded spot he saw when he realized he was dead. By the sounds of it, the wounds on his arms are the only visible wounds on the body (and it was just the random construction worker who found the guy that called them 'defensive wounds').