So I've seen a lot of theory that Partridge is RJ and not really harmed, but if you watch the scene where he is found, two things appear to contradict this;

1- The door has a flip and slide bolt to close, not able to close from the outside,,,,
2- As he came out, you can see the twist ties around his wrists (used by police these days)

I don't think RJ would put himself in a vulnerable position, not really his style.

I picked McAllister because there was no choice for:  "I haven't a clue"!  :) The possibilities are seemingly endless...

Oh, another thing I noticed was a comment that the blade looked like a scalpel that ME's use... To me it reminded me more of a "carpet cutter", but it did look like it had an edge on both sides of the blade maybe something used to gut fish or game.... check this out and note the brass sleeve...http://www.pacificsod.com/per_imgs/knife.gif

But I have enjoyed reading all the theories.... should be interesting to see where we end up...