I've posted some of the below in comments because the site wouldn't let me upload a new theory ... but here goes...

I think a persuasive way of reconciling Cho being a good cop with the body in the morgue being not BP is as follows:

- Cho is working with Jane whereas at the same time Jane is misleading Lisbon (I like the Lisbon is bugged theory/ies);

- this is supported by one of the advanced reviews of "Red John" stating "it is always good to have Cho on your side";

- either Cho noticed that the body didn't belong to BP and only told Jane (when Lisbon wasn't around) OR Jane specifically asked Cho to not draw any attention to the face.

After watching the scene where Lisbon & Jane discuss the possibility of BP being a member of The Blake Association I am more convinced that perhaps Jane is setting something up. All Jane says is "Partridge", then Lisbon brings up the fact that he said "Tyger, Tyger" to her before he died. Jane then says "He was asking for help" ... but this doesn't make sense, he is dying, obviously killed by someone, so why would he only want help from a tyger cop, wouldn't he take help from any cop? Seems like Jane is saying this to throw RJ off track (if he is listening through Lisbon). (BP fans, including myself, would want to believe BP said this to throw PJ off track and unravel The Blake Association - not asking for help).

Then Jane says to Lisbon something like "we have to see the body"... If RJ is listening in, and used any body that looked similar to BP (without a tattoo), maybe it was easier for RJ to get a TT member in the Morgue just to cut off a chunk of the left shoulder instead of imprinting the tattoo on? (or perhaps at the time they cut off a chunk instead of tattooing it?)

Also, Jane specifically says he wants Cho to do this ("have Cho bring a shovel"). Then Cho sends the image of the shoulder to Lisbon and not to Jane (Lisbon shows Jane) - perhaps to fool RJ into thinking they are following up the shoulder which is what RJ wants them to do. (We know Jane can also receive emails --- Van Pelt sent him the coded message from the vault).

anyway there a probably lots of ways to explain the above (or perhaps there are no clues embedded in that exchange at all) --- but it's always fun writing, sharing & collaborating on theories :)

I'm not as sure as I was last week that BP = RJ, but we have a few days to keep the (awesome) story alive even if it turns out not to be the case :)