BBM
This has concerned me, too. I don't have kids, but most parents I know (including those I baby-sat for) and my own mother, would call in from time to time and let me know when they would be home. MR had told DR, by his own admission, that he would be back home at 11:00 a.m. Monday but said he didn't get home until 11:30 a.m. The one-way trip to/from Durango is about an hour's drive. Why didn't MR call Dylan before heading home to let him know when he's be there?
One thought is that when MR didn't arrive home at 11:00 as promised, Dylan set out on his own. Problem is, there is only one road going to and from the Lake area, and it's over 11 miles from MR's house to the next major thoroughfare (240 & 501, I think). If Dylan did plan to hitch a ride, I doubt there would be traffic until he reached the intersection. It's a 9-hour walk to that intersection and his dad would certainly have seen him, on his drive home, unless something did happen to Dylan within 1/2 hour from leaving the house. It's not likely a predator would search for a victim on a road with only one way out and not even close to a major thoroughfare. But, I guess Dylan could have been picked up by someone who lives around the lake. It's more common for a child to be victimized by someone familiar rather than a stranger.
Then, consider that all of Dylan's belongings, including clothes, are missing. I suppose he could have been angry at his dad for not taking him to his friends' house the previous night, his dad taking his cell phone from him and turning it off (presuming that's why he wasn't texting), and then not returning from his appointment as promised, maybe Dylan packed up and planned to spend the remainder of his vacation with his friends. I could imagine Dylan's anger building to that point. But, if this is what happened and Dylan was abducted or the victim of an accident while hitching for a ride to the friends' house, why didn't he first call or email the friend to let him know the plans?
I'm hoping investigators will have some answers as to whether they believe Dylan even reached his dad's house Sunday night, or something happened to him after they got home that night, after evidence collected from the home and trucks is processed. That could take a while, and it could very well be inconclusive. I really hope Dylan eventually shows up, unharmed, but I know that really isn't likely.