They're setting up Mr. March to be the TCK but I think the same rules for the Murder House apply to the Hotel Cortez, they can't leave. So either he has a partner, or they're trying to lead us in the wrong direction...
Also I doubt its Mr. March, he hates God and wants to kill him. The TCK seems to be punishing and targeting people who are sinning. I think its a rival of Mr. March, maybe even the one who turned him in.