A few thoughts...keeping in mind that Mr. Klein is not an exceptionally precise writer IMO. Although his strange wording actually may be more clever than it appears to be.
His team has ruled out a "forced abduction." By definition, an abduction IS forced, so his wording seems redundant. I think he may mean that "stranger abduction" has been ruled out in this context since under this point he has specifically ruled out two sets of strangers who could have participated in a "forced abduction." DeOrr would not have gone with them willingly and would have to be "forced."
https://www.facebook.com/KleinInves...3864945696095/939454592803792/?type=3&theater
However, if DeOrr went voluntarily with someone he knew, that would not be initially "forced." But it would become an "abduction" (within the definition that an abduction is forced) when DeOrr was not returned. So it seems possible that Mr. Klein, by using the redundant word "forced," is leading our thinking toward DeOrr having gone with someone he knew, rather than strangers. This possibility would also tie in with the legal use of the word abduction...
the illegal removal of a child from parents or guardians. (See link below for all definitions.)
I may be trying to make sense of what is simply sloppy writing, so I'm not at all sure this is what he meant.
http://www.oxforddictionaries.com/us/definition/american_english/abduction