As big perm touched on:

Let's rule out:

Reede. He's chubby period.

Styles. He's too old.

Bertram. Heller said "RED JOHN IS A WHERES WALDO CHARACTER". Bertram is a regular. Period.

McAllister. PLEASE the dexter and Sopranos writers would be better than a Mcallister red john

Kirkland is a FORMER RJ VICTIM. That's why he changed his look. To track RJ unnoticed.

Haffner the seasons "Red herring".

BRETT PARTRIDGES VOICE MATCHES!!!!!

Go to YouTube and search "Jane meets Brett Partridge"
And watch the "forensics guy" video. You'll be CONVINCED!!!