I think if he did it, something happened after McDonalds and before they got home. I think this is why there is no evidence and some think if he did this he committed the perfect crime. I don't think IF he did something to Dylan, that he transported him anywhere. I think Dylan is where it happened and somewhere between Durango and Vallecito. And closer to Durango. JMHO
I do feel like the 8:01 texts were probably Dylan and obviously LE has those pings. Where was the phone pinging? In Durango or Vallecito or somewhere in between?
I think the 9:37 text was not Dylan and probably came from MR's home. I've asked over and over if cadaver dogs were used on MR's trucks or home and never gotten an answer. I don't think the dogs that were at his house that first night were cadaver dogs. There would have been no reason to bring in cadaver dogs at that time. They thought he might have ran away at this time. So the dogs must have been scent dogs brought in to track his scent. There would be no evidence of a crime in MR's vehicles if the crime happened outside the vehicle and he was not transported anywhere.