I always roll my eyes a little when people (not you) say "they're not the type to run away". Any teen could run away.
If Tyler ran away, it could be that he wanted a bit more adventure. Or it could have nothing to do with the home situation at all. If there was anything in his life going on that he felt he wanted to run from, he would per definition 'run away from home' - because that's where he lived, with his parents. That doesn't mean he's running away from his parents or home situation.
That said, a couple of things that I've read in this thread about what's been going on made me raise my eyebrows. In my many years on Websleuths I've obviously seen quite a bit of the dark side of people... and I guess my hinky meter is starting to come to life a bit. I hope I'm just jaded from the bad cases we've had on here and there's nothing nefarious going on within the family... since we've been told LE is taking this disappearance seriously, I hope that if they suspected such they'd call out their own search parties, even if it is against the family's wishes.