dr marvin candle is the one armed man.

marvin candle's left hand - arm doesn't work...
this explains why he doesn't put his palms together when he says, "namaste"
only one of 'em is real. he's got a fake left arm.

the video is linked behind the orientation film can on the right.
look closer.

ray mullen, the farmer guy that turned kate in last season, has a fake right arm.