Thanks; I understand the distinction. We can't really speculate much beyond what his parents have said to the media, but I'd be interested to go back and re-read their wording in the frame of this theory.
My follow-ups... Would LE offer a reward, organize search parties, and hold press conferences for an adult they know to be voluntarily missing? (What about if they believed him to be a danger to himself? Would they specify?) Would his parents be willing to lie to LE, at the risk of being charged with making false statements, in desperate hope of finding their son?
IMO, the first question is much more objective than the last. Again, we can't speculate too much, but they're practical things to consider with a theory like that.