I think Danny is Red John - he's been top suspect among others.

1. Danny had an act on the carnival, just like Jane before becoming a con-man. Cho confirms this Cackle, Bladder, Blood - Is this how Red John came about?

2. Where Lorelei was killed it had things you would have a carnival if you watch that scene again you'll see a rocking horse and those games where you have the hammer and whack it to score points.

3. Ruskin means "red hair one" 

4. Danny means "God is my judge"

5. As for the smiley face this may come from the carnival 

6. There was also, a caravan where Lorelei was killed, when Jane revisited the carnival there were caravans - Is Lorelei murder scene a huge clue?

7. Danny was angry at Jane for taking his sister away - was killing his family an act of revenge?

8. Considering Danny was family they weren't close - due to him being angry.

9. If Danny is Red John, what caused him to kill people before Charlotte and his sister?

10. Red John liked the blind girl to play the piano, shown in a flash back Charlotte was a gifted in this from a young age.

11. I don't think they are both dead - I think Charlotte is still alive - because when Jane drank that tea he only saw Charlotte and not both of them. 

12. There are no date of birth or death on there grave stones - Patrick would know why surely or a least question it? Danny asks him this: "Why haven't you been here since the funeral?"

Patrick: replies "Because they're not here."

Thoughts?