Some things that I think are important to consider.
RAT did not need SM to become familar with Alexis, a small town and (I believe when this case first broke, I saw mulltiple internet article on her volleyball games) probably the local newspaper has featured her throughout her volleyball career. Where I come from, at the beginning of the seasons, team photos are also released in the newspaper and those considered stars of the team get generous coverage throughout the year.
IF it is determined that RAT is involved in other missing person's cases, it would appear that the act of abduction is one that would probably assume a violent act IMO (likely given I saw that it stated "by force" somewhere on WS I believe). I feel as though the videos he purchased may be of a violent theme or nature and perhaps not necessarily about underage girls. IMO
Again, I struggle to see how he, who has a fairly lengthy record, would manage to never be caught with anything more hardcore than one possession of marijuana charge. It can easily be a combination of poor genetics, drinking, a lot of sun exposure throughout the years, but at same time, it would be difficult to prove drug abuse if one were abusing their own prescribed medication. All of this simply MOO