If you read back through this thread and others, you will learn that he is a rogue cop who has previously showed a blatant disregard for his authority, and human life. He has been said to have "issues" and was scheduled for a final Grand Jury pretrial on April 22nd, the morning after the Rhoden's were murdered. It has been suggested that he has motive (money to flee), experience, including K-9 handling, that he worked the night shift and would have likely (just as LE was likely) to have known about the Rhoden's illegal activities. It is not difficult to speculate that he is at least as potential of a suspect as anyone else discussed in this case. imho.
Money to flee as a motive? Wouldn't require killing 8 people.
I don't know if he comes into direct play or not. He does make me wonder about the Pike Co Sheriff's Dept as a whole and whether every person there employed trusts every other person working there. Certainly in the early days when you have the AG, BCI, FBI, DEA and all descending on the scene, I bet there was a whole lot of side-glancing going on before establishing trust.