Could Red John be someone from the carnival Patrick knows?
In the last episode they find Lorelei's corpse amongst carnival items. At least one item, a yellow and red pedestral appeared too in S03 E02 (Cackle-bladder Blood), where Patrick and Teresa visited Patrick's old carnival.
Also, tvguide.com writes: "This season has been about Jane digging into the notion that it's not that Red John could be anyone; it's that Red John is one of a very specific set of people that Jane is uniquely qualified to investigate," Tom Szentgyorgyi tells us. (Link: http://www.tvguide.com/News/Mega-Buzz-New-Girl-Following-Spoilers-1062691.aspx)
Could this set of people be the carnival? What other group of people is Jane uniquely qualified to investigate? And if so did we see Red John already in S03 E02?
I watched that episode and there is only one person who caught my attention, a man in an overall doing some manual work. (appearing at 09:26 and 13:26). He could be in the early 40s, is Caucasian and has short hair. According to Rosalind Harker Red John has rough hands which indicates that he is someone who works with his hands.
Points against this theory: Red John could have placed Lorelei amongst carnival items to taunt Patrick. And he doesn't seem to be someone who would give away such an important clue unless he didn't have time to move Lorelei. Red John's rough hands could have been a result of his long-lasting construction work in the cellar in S01 E23 and it might have been a singular event.
What do you think?
