The Panopticon/Sleep No More: Rassmussen

From last episode Sleep No More we have two character pages: Gagan Rassmussen and the Patient Zero. But... what I saw in the episode it's that they are the same character indeed. Gagan was the first to undergo the process and was transformed in a Sandman, then in its fake human form plotted all sort of things and interacted with the Doctor and the others. Am I delusional?