There is no doubt that Partridge is the RJ simply because there is no evidence proving the opposite ..
And for those who oppose this they can that Atfhso this

As you have seen everything conforms with the specifications of RJ
; And also remember the one RJ crimes in Season 2 Episode 8 when he was killed RJ
Janet Beck + Carter Peak فاليكم, the ultimate proof that Partridge is RJ:

http://images4.wikia.nocookie.net/__cb20121009222825/thementalist/images/1/15/Vlcsnap-2012-10-09-23h....