It's difficult to tell with Saizo, but I think he did genuinely forget the MC. I'd like to think he wouldn't deliberately "test" her like that, given that they already have a pretty established relationship by this point. It's not the first time MC's been in danger, after all, and she does know what he does for a living... Saizo's epiphany might have been off-screen. Good question, though. Even after saying all this, I'm not really sure.