Red John appears to me now to be Tommy Lisbon, the brother of Teresa Lisbon!

- He fits the physical description perfectly.

- He has an affection for Teresa (his sister).

- As a bounty hunter he has ties to law officials and authorities, especially by name dropping CBI family members.

-  His name is Tommy, which is a nickname for Thomas - we all assumed that Bertram was going into Sherrif Thomas MacAllisters storage unit in the last episode, but I believe the Thomas was truly Tommy Lisbon.

- He fits the "Wheres Waldo" description, because he appears or is
mentioned throughout the series and is in the background as a part of
Teresas past through the seasons.

-  His daughter is named Annie after a famous red headed fictional character.

-  In 1988 he was a kid at the farm, but I suspect that first killing was actually done by Teresas father and Tommy adopted the Red John persona thereafter.

- As a bounty hunter he has a good shot, like Red John.

- It would be an unexpected reveal and fit the Keyser Soze descrption as Tommy is percieved as needing his sisters protection and somewhat weak on his own.

-  He must have shaken hands with Jane when they met.