RJ's voice "i don't like cheap imitations of my work" when he saved PJ is 200% that of Plotnick (partrige) it's the same vocal timber in the criminal minds promo S06E07 the gatekeeper.

Either he is RJ, or heller used his voice like others too, to keep RJ's identity secret.

i don't think BP is RJ,

the CBS had something to do with the appearence of plotnick as a serial killer in another show to please partrige fans,, but i think its way not enough for those who really believed that he was and still is RJ.