I'm struggling to see how Jane could be Red John ?

In the episode Red Johns friends, Jane is at the CBI with the team while Red john kills someone. 

Need more evidence ?

In the season 2 finale Jane is tied to a chair by 3 people who are going to kill him when Red John appears and shoots all 3 people and then knifes them to death. He then picks Jane's chair up and sings a poem at him, we see them face to face !

He can't shake himself by the hand.

And lastly in the Season 4 finale Jane gets into a car and talks to red john down a phone. Red john responds and hangs the phone up.