It does seem like a stretch. But if he was premedatating something he might not want the Ramsey's to know he was at the Michigan home.

Of course they would have let him use their home. But it dosen't sound like whoever was there, was on a family vacation. And the NUT, whoever he was-- had his suitcase in a little girls's room. The same girl who was murdered shortly after the discovery that someone was probably sleeping there.

No forced entry; he may have had a key. I hope the cops checked the rental car companies and the locksmiths in the area, to see if any familiar names popped up.

It's possible he flew there alone for a couple of days without anyone knowing where he really was.