If I were Patrick Jane, I would have easily found out who RJ was. Simple, gather all the 5 suspects at his home. Give them coffee or beer or anything to drink with sleeping pill spiked in them. Once all of them fall asleep, check the ones with tattoo and bring Rosalind Harker to identify who Roy is among them. That would solve it. Simple. Bruno Heller does not know how to write stories. Poor him.