I agree that Dylan is not a runaway. Even if he left with those intentions (which I don't have any reason to believe) he is not hiding from everyone as a runaway at all IMO. Like I said earlier, he may be a teen- but he's a YOUNG teen. And his home life did not seem to force him to grow up beyond his years. He'd have made contact or come home by now if he'd simply run away.
I wonder if this theory is enough for LE to rule it out conclusively? or do they have concrete evidence of something else?