I'll try to be clear.

There was a serial killer, Todd Johnson, that used to kill only cop, ordered by Red John, his lasts words in the hospital was TYGER TYGER, maybe he was trying to give a clue to jane about this Tyger Club. What if RJ wanted to kill those people and asked for Todd to do it?

Following this line, Todd Johnson killed the husband of Hightower, what if he was some of them? Why the hell the aunt of Hightower called Jane "Poor Lamb", does she know something about or just Heller trolling?