Please see the post I just posted. You are confusing stranger abductions and slight acquaintance abductions with stereotypical kidnappings. In the same table in my last post, you'll find the number non-family abductions that are perpetrated by slight acquaintances, and directly to the right of that, you'll find the number of stereotypical kidnappings that are perpetrated by slight acquaintances.
Stranger abductions and slight acquaintance abductions are not synonymous with stereotypical kidnappings. There are more criteria that must be met to be categorized as a stereotypical kidnapping than whether it was committed by a stranger or slight acquaintance.
It's all detailed in the document
http://www.missingkids.com/en_US/documents/nismart2_nonfamily.pdf
ETA here's my last post I'm referring to
ETA you actually listed all the other criteria for a stereotypical kidnapping in your post
and involving a child who was transported 50 or more miles, detained overnight, held for ransom or with the intent to keep the child permanently, or killed.