it wouldn't be Logan since he has better ways to kill himself and enjoy it at the same time - drugs - and he would be too chicken to kill himself any other way.
It CAN be William --- you see the scarf he always wears around his neck....and always has on black gloves?
You didn't see William remember anything--- all you saw was the bathtub clip which is supposed to lead you to think it was Juliet
a Mistake? Have you known anything in Westworld clips to be a mistake? Nope...on purpose for sure just to see if we're paying attention