1stly i hope it was Red John. my opinion various because each person has had good opinions on if it was The REAL one or not. i think what they SHOULD do is have it Be Red John to be honest. because yes the show is based on RJ but you can only do a story so long before it runs out of steam. what i think is a few things, for one if you recall RJ also had a gun & if they say Jane put it there.
his fingerprints aren't on it. & yes we haven't learned who he actually was. other than Bradly Whitford! he he. a damn good choice for the role i must say. to be honest since i really didn't read the credits i didn't notice if he was credited for the episode was he? or was it a surprise?
anyways next season my guess if it actually IS the real RJ which i think like i said it SHOULD be. fans will be pissed off if it wasn't. cause we all know that Jane isn't one to kill anyone. yes he killed a guy at the end of season one wasn't it? but other than that i mean & we know that Jane doesn't just shoot anybody. he tries to talk his way out of it. the CBI know this as well. next season my guess is they will start with who else are his followers? & if they get an ID from RJ"s body what if he's someone important? & that's how he gets people to do his bidding.
kinda like how that one fat guy in season 5 maybe? of "CSI" who's fetish was dressing in a baby outfit & he was someone that people just didn't like. he had his files on people that he kept just in case. maybe it will be something like that? of course without the baby outfit. THANKFULLY!
we know he prolly will get out of jail at some point. yes Jane's goal was to kill RJ, but i am curious if he will stay with the CBI when he gets back there at some point i mean. my guess is they will go to him while he's in jail to help solve crimes. he he. hell maybe while he's in jail he will find another one of his followers? they may even have a package delievered to CBI upon RJ's death that is addressed to Only Jane.
on my guesses on what that may contain i have no idea. but if that truly was RJ they may have his followers take his place but prolly not use his signature. maybe? or they may give us another serial killer that'll take another 3 years? i dunno i'm just guessing here folks! he he