Well put. Just because he's not reacting to this the way other people think he should be, doesn't mean anything. Everyone deals in their own way. Heck, I think if my Dad had ever been put in this situation and got to this point, I could have seen him breaking down and shutting down because he would have felt helpless and like he failed someway and he would have shut himself away from people to deal if he didn't feel like he could do anything and people were already making up their minds against him.
I mean heck, when little Jessica Ridgeway went missing there were plenty of people even locally for a while pointing the finger at her Mom or family members and scrutinizing their every move because they thought they were involved and that turned out wrong. Hopefully it's the same here, I mean...aside from the outcome. =/
Someone could have taken him. I mean, we don't know WHEN Dylan left the house if he left that morning after he Dad left. He could have left at 7:49, he could have left at 10am. If it was later in the morning, there's a better chance of a random person grabbing him. And sadly, there's monsters everywhere. You don't always know who you're living near, even in a small town. I mean, look at the Janson family in Bayfield back in the early 80's, both of their daughters were stabbed brutally by a 13 year old neighbor boy!! You just never know.
I hope there's a happy ending in this case. Something miraculous....but you just don't know.