In six years, he has citizenship??? He's probably on the expedited Muslim track. I've known other people who have had to wait for much, much longer.
As for the guy in Houston, the thing that seems odd is that nobody has been able to find him or even seems to know much about him.
You only have to be here for 5 years to be eligible for citizenship.
As for the Houston guy, I wouldn’t be answering the phone either after all this.