Okay,the scene from the past explained is Rebbecas murder(Smith arranged for someone to get in the cbi to kill her)-this also opens question why would Bertram if being Red John try to get someone from the outside in the cbi but that is not my point here...I have two questions and would like to hear Your opinion

1) Who was the person from the past we haven´t seen for a while apparently showing up in this episode(flashback of Bosco?-this just doesn´t fit the announcemenet)

2) Why did Red John kill Partridge,what is the meaning of his skin removed from the shoulder(obviously to hide the tattoo but why?)

Please comment.