Newest episode revealed something that loads of people believed is true since sometime (the organisation). We do not know if Red John is part of it in any shape or form, there have not been any clear evidence to show that he is part of bigger company, but a very powerful men that has been mixed with loads of different groups and people with vast identities. The voice that is used for Red John's character might be manipulated allowing one of the 6 suspects that are left (Reede still counts as suspect due to fact that he came as great liar with Kirkland) to be Red John, however I do not believe that is the case; I believe that Red John is someone who are we missing out completely, someone who is quite a character that we well know from the part that they are playing at the moment and soon there will be a twist and this character will start showing more on the episodes from side and stuff that you we have not seen before or heard of.