I recall an old article about Hubbard paying for prostitutes. I would look at prostitutes from the area in Colorado he lives and where he travels. Any missing? We've had some rather infamous track prostitutes that have disappeared, no doubt buried on the rez somewhere. "Turned out to pasture", but not until they near 60 and lose that last tooth.
I would look at Creepy Herm! Funny how he disappears only to turn up just as the town is hit by a couple of rapes. Coincidence? Me thinks not!