I have different reasons to believe Kirkland is red john.
1) He fits the description made by Rosalind
2) He has around the age to be a 'young boy' by the mid 80s, when the incident in the barn took place
3) He enjoys the same orange drink Patrick does, we can see this in different chapters. Also, both Patrick and him had similar parents, who did not care about their child. I say this because throughout the seasons, we are told Patrick and Rj are very similar.
4) He has the powers and resources to commit the crimes he committed, and we see in season 6 he is capable of killing. Kirkland also suspects of a super secret organization.
5) He is creepy and suffered a trauma by loosing somebody he loved just like Patrick.
Besides all of this, I am still not sure what to believe. Patrick says the list has now been reduced to 5 suspects since he was not one any more, though the twin story make everything more confusing. Also, I don not understand why he killed rj friend in the hospital, if he really wants to catch it.
All this are things confuse a lot, and though I am not sure, I believe its him.
