I dont know, everything I know tells me it has to be Liz but I still expect them to suprise us. as for the argument about Lizs body size/type versus the carvers...none of the actors (sean, christian, liz, etc) have played the carver so far, it has been someone else. none of the actors know who the carver is yet (well, I guess by now they do since the episode has already been filmed) and the director had not decided yet who it would be when he decided who would wear the outfit and mask.
I cant wait. I like Liz and dont want her off the show but she is the only one it could be in my mind. only 5 hours left till it airs in my time zone.