Just a little warning first, this thread might contain some spoilers to the Saw series.
Okay, so basically my question is, why would the Entity take Amanda rather than John? Why take a henchman (not sure whether this is the right word) over a master minded psychopath that always thinks one step ahead of everyone?
It certainly can't be the fact that John didn't actually wanted to kill his victims rather than teaching them a lesson, since we also have other killers in the realm that didn't mean to kill in the first place e.g. Wraith or Hag.