I believe that Partridge is RJ because all the clues that we have which bring to him.
And if we see the other suspect there are a lot of incongruity for everyone.

-Bertram is too tall and bald.
-Smith is too fat.
-Stiles is too old.
-Kirkland for the time line.
-McAllister,seriously? He appeared only in the 1x02.
-Haffner,yes he could be RJ but i think he is his best friend since the Visualize's farm.

Rosalind's description is Brett Partridge's description.
Maybe Bruno Heller has change his minde.
We will see.