What they said was that it was the last place he was seen, and they believed he either left the home and was abducted or something happened to him in the home. What I said earlier was that they would most likely be looking for signs of a struggle (blood, etc.) or something that might indicate who he may have left with - emails, texts, IMs, photographs, etc. If he was (supposedly) known to have entered the home, and nobody admits to seeing him since (other than his father), he either has to still be in the house or something probably happened to him. I have no idea where the bolded part came from; I said that those would be the type of things they would be searching for. MOO
ETA: Looking back at my other post, I really didn't word things the way I meant them. I can see why you misunderstood me.
The last cell phone activity is in the middle of Dylan confirming plans with his friend for the following morning at 6:30 AM ... texting a friend ... making sure that it's okay with his friends grandmother if he shows up that early. It sounds like Dylan thought that was the only time to get a ride, he checked with his friend, his friend okayed it and isn't that the last of the correspondance. That abruptly stopped at about bedtime, but according to the father, he and Dylan were watching a movie.
If the dad did it, he had plenty of time to hide a body since he was unaccounted for during most of the day. It would be interesting to map out dad's timeline between the time that Dylan's plane arrived to when he knocked on his sons' friend's door.