If Sylvia had to choose to be anyone she would choose to be Cilla Black. When Cilla Black was alive. Sylvia is not so down on herself that she would choose to be someone else when they were dead. If she was choosing to be someone else even though they were dead, she definitely wouldn’t choose to be Cilla Black. She would choose Aretha Franklin or Dusty Springfield because even when they’re dead they’re still more alive than Sylvia has ever felt. Being them when they were alive would be too much living for Sylvia but she thought she could manage being Cilla Black on a good day even when Cilla Black was alive.