I was really gung ho about calling this a murder and a cover-up was in place. But then I saw the time line and my opinion changed.
Why? Because it happened during the day, during school hours. If this had happened after hours when most people had gone for the day, and there might not be supervising adults in the area, I can see a fight and murder possibly taking place and body concealed. But there was a gym class that entered soon after. Unless that class and their teacher murder Kendrick, I don't see it possible that someone could have murdered him and stuffed his body in the back without being seen in such a short time.
What else makes me think this wasn't a murder? Well, if he was beaten to a pulp and placed in the mat, there should have been blood on the other mats too. His body was also in a mat that was buried in the back of other mats. The murderers would not have been able to kill him, move the mats out, stick in him in a mat, and then put them all back so quickly (or at least without the video showing). Plus there would be smear marks and more blood from them relocating the body.
Sadly, it appears he died by accident. I am puzzled about his shoes, but perhaps those came off as he was kicking to get free? The timeline article below also says one shoe and his books were on top, so it's possible he grabbed one shoe out, but then when he was going for the other he got jammed in. The neck trauma in the new autopsy could have been from the position of his body and the weight of his body on his head?
Also, the shoes he was retrieving were his gym shoes. He enters the gym, goes to the mats where he left his gym shoes because he was supposed to head to his next class. The white shoes are his street shoes.
Here's the article with the timeline again that was posted earlier.
http://valdostadailytimes.com/local/x6223544/Timeline-of-a-tragedy