This should be a no-brainer for Adam. If he keeps Rachel, he's at best fourth in that alliance. As a floater, he needs to keep another floater in the house and get rid of the power player.
Also, when are houseguests going to learn to NEVER volunteer to go on the block and/or NEVER throw a POV? What are you thinking Lawon? I want him to stay over Rachel, but he deserves to go after such a foolish move.