Guys i think jane has another suspect beside the other ones
and thats why he kinf of smiled when red john knew the list of suspects
so i think probabley the 8th suspect is redjohn or redjohn's associate .

This is my personal list of suspects and it has only 4 suspects :
Raymond Haffner ( because of sophie miller's descriptions )

Bob Kirkland ( because he is the smartest one in the show after patrick and red john and he also killed lenon who was the only one knew who red john is )

CBI Ron ( i dont think a have to say why , he is around always and if he dont have an accual part in the show then why is he even in the show ! and more thikns was said in the last theories so i dont have to say it again )

Walter Mashburn ( because he is charming , rich , has power and no one will ever tell that he is red john , so maybe he accualy is red john .. and between you and me the passion of sophie miller ( washburn ) , im pretty shure he is red john not jay roth and washburn = mashburn ( turn the m W ) )

and Brett Patrtridge if he is still alive