Please stop with the retarded twin theory bullshit, i mean that absolutly makes no sense at all.

In season 6 Red Listed Reede Smith talks to Bob Kirkland(in the end), [EVEN calls him BOB], and they were talking about what they did speak in the park while drinking coffee a day ago. Well and then he freaking shoots him 5 or 6 times. So Red John is 100% not Bob Kirkland.

Some of you might think now :"huh but maybe its his twin brother who is red john and we didn't see him once in all 6 seasons or ever heard of him". No, just No. That would be the most retarded ending of a great series.

There's a thing called brain, some of you ppl should sometimes use it