The letters in Thomas McAllister 's name spell out molest him as cat.  Psychotherapists theorize that "there's a desire to merge here," on Red John's part. Red John wants Patrick to be like him. And perhaps he wants to be like Patrick.  The poem Tiger Tiger is about a hunter calling out his prey - supposedly a tiger.  The hunter (in the text of the poem) is trying to merge with the tiger, while hunting.  McAllister said to Jane "I've been a hunter most my life".  As the cat (merged identity) the hunter is supposedly gaining ground (advancing) on his prey.  Knowing your enemy as the old saw goes.  In one episode, Harker Rosalind was talking to patrick jane, while red john was there.  Red John was mimicing Patrick Jane: his posture sitting crossing his legs drinking tea;  Red John was trying to merge himself with Jane.  IN red sky in the morning Red John was rubbing Jane's shoulder- which hints at Red John's psycho sexual urge to merge with Jane.  The theory is about Killers needing to return to innocence; its what drives many killers to kill again.  They feel righteous, but they sink to depths - in their mind.  To get out from the darkness, they seek routine.  McAllister is about as routine as they come.  The poem Tiger Tiger references a similarity between Tiger and Lamb - by having the same creator.  The tiger preys on animals that are similar to lambs, so the tiger wants to be like a lamb.  The hunter in the poem is seeking to merge with his prey much like Red John sought to merge with Jane.  McAllister was an avid hunter.  He played rock paper scissors with Jane.  Jane had to switch his gesture, because McAllister was trying to copy him.  Jane was seeing the competition as coy rivalry, but McAllister was getting angry about losing.  I think he snarled at Jane.  In the second episode of the show, McAllister is clearly seen as Jane's antagonist which is rivaled by Red John.  The two identities merge, in the episode titled "Red John".  In a sense, Jane has done his merging - by killing Red John he cannot merge.  Jane is at peace, and the episode titles reflect that - by excluding the color red - from the title ( of the episodes).