Okay So Felt the need to explain something. When Lucas was a demon, hed come back whenever he dies. As an angel, he can come back, but his memory will be removed. He will remember his childhood and name, and stuff like that. But he wont really remember anyone outside his family, including people he dated and anyone who adopted him (sorry Silen-) And even though he removed his "stone", it'll be back when he comes back to life.