Well...
Red John got some "very powerful" friends.
I think it now makes sense, the way I see it.
It's an organization & their password is "tiger tiger" and probably everyone in it has the "3 dots tattoo"

that's my only explanation to last episode when 3 of the suspects had the tattoo.
but there's noway red john can be an organization or multiple people.
its an organization led by Red John.
or at least he's a very important member in it.

and I read somewhere that the writers confirmed that Red John is actually one of the 7 suspects.
and I have this strong feeling that Red John is Brett Partridge.

the only logical proof that he might have faked his death.
you know... since he's got powerful friends and stuff.
I mean do we even know for sure that he's dead? or where is his body.
I think he was acting when he fell off that thing, and wth... his only words were only (tiger tiger)..

until we know for sure he's dead.
I think he really is Red John.