To all the people who say that RJ is Michael Kirkland- wouldn't it be weird for RJ to turn out who only joins at the last moment? Also, Heller said that we already saw RJ. Now you will that it was Michael that killed Lennon in the hospital, but why would he ask him if he recognized him? Surely if he is RJ, then Lennon would know him. Especially as he led RJ to Lorelei's sister. Additionally, twins don't looks exactly the same after 40 or so years, their appearance changes depending on their lifestyle etc. We know that Michael was an alcoholic for some time, whilst Bob was leading a relatively healthy life.