I apologize for my English but I'm French.

And if Red John was a woman?Erica Flynn (Morena Baccarin) has all the features: brown hair,  age, she is a sociopath. Moreover, we see manipulative, getting everything she wanted, especially among men. For example, we see an episode that CBI Ron offered him tea with a knowing smile.

Finally, if lorelei was not afraid to measure red as red can be john john is not monstrous but physically fine.

Patrick  succumbed to her charme. last words exchanged between pj and erica are "we'll meet again soon."

A theory that surprised everyone but with a big problem. She has appeared very late in the series and starred in Homeland