I'm not saying i don't think he's involved, and the charges indicate that LE have evidence saying he is somehow involved, but if you take out speculation and some pretty significant assumptions, the info available publicly doesn't conclusively indicate his involvement beyond sunday.
Not sure how you can say the bolded statement above. There is lots of evidence that points the direction that he was involved beyond Sunday. Trailer with TB's truck found on DM's mother's property. Neighbours say it was brought there late Wednesday night. Police don't just go about arresting and charging people because, obviously there is lots of evidence indicating he was involved beyond Sunday.