OK, can we talk about some things? http://www.imdb.com/title/tt3196216/fullcredits?ref_=tt_cl_sm#cast

1) Brett Partridge is in the episode entitled Red John
2) So is Kirkland.
3) So is Timothy Carter, that Patrick already killed, credited as Red John
4) Walter Mashburn is also credited as Red John

The only suspects not credited in this episode are Brett Stiles & Reede Smith.