Mashburn is STILL my favorite suspect! I don't care about any list or verbal promise a Hollywood suit is dishing out. --- 

 From Theory #4018  Sezaru
" In the last episode of season 5, “Red John`s rules”, Lisbon  says to Jane, “I can keep secrets”; he disagrees, but in a very weird way."

--- I'm thinking they put that whole scene in there for a reason.  Lisbon thinks Jane doesn't know about her tryst with Mash-- Jane does.   

The Powers That Be are giving us little snippets that ---yes--- there will be future sexual tension between Jane and Lisbon.  Who could test the loyalty between two people more than a love interest?!  Hmmm??  So let's look at the creative and genius plot that could unravel if it would turn out to be Mashburn.!!!  

 We already know that Walt fits the mold and description.  (Stop harping on the height thing.  A couple of inches from a blind womans comment from 3-4 years ago is moot).  He may have only been in two episodes but has been eluded to a few times, right?  Therefore, I consider him to have been a suspect that's has been right "under our nose" the whole time.  Who would expect it from him?  He is such a charming guy!  Suave,  arrogant, cocky...oh wait... I just described PATRICK JANE!!!!  Again-  BOOM!  Another genius reason the writers and Heller  should bring back Mashburn to the mix.  He was the one guy Jane never really was able to get under his thumb.  (You know that would have to bother Jane!) 

I guess I just want to look at the most exciting and story-worthy possibility in these scenarios cause to tell you the truth... the list that we have now is quite yawn-worthy.  Unless these writers come up with some fabulous back story that goes deep into Jane's past and gives us some incredible insight that we haven't seen....meh.   Give me a Jane, Lisbon and Mashburn triangle.  It would tie up a season finale so superbly.

So...if Heller is telling the truth....he's making a VERY big mistake.

(IMO, of course.)