"He totally could, though. It's not as if SW, being who he is, couldn't access his flat anyway, whether he was there or no. And also he'd definitely leave if he felt unwanted (while also definitely still keeping an eye on ZYL)."

I meant censorship-wise, you can't really leave someone alone in your apartment without the implication that they at least have the key? Because either you just locked them in, or they have to lock the door behind them when they leave. But it is a fantastic point that the Envoy can come and go without a key, the drama could have used that as an excuse. :D