People who said that red john is one person different that appears in the list,  please , reconsidering that. 
Brett Patridge it could be the winner of who is red john  . If the episodes dosen't lie, and i don't think so, he is the perfect for Rosalie's description, he loves to see the fear on peopels faces , and uou, he appears always when red john murder someone.
The other suspecs are bad people, people who had a trouble past, probably relationated with red john, but they don't are him.
The question now if how can he knows the 7 suspects and if it is true that mentalist exist. I hope that Jain could answer that on the new season..