To the audience Tyler is so obviously a spy that Lorca’s not just callous, he’s a fucking moron. Tyler is played by Shazad Latif, who also plays the albino Klingon Voq. (Edited, 11:05: At some point between writing this and publishing this, the line that Latif had a dual role vanished from Wikipedia. But this theory has been floating around for a while, based on the name given to Voq being attached to an actor with no other credits and Latif’s birth last name being the same as the credited actor.) We do know Voq went to learn skills from the House Mokai—a house with matriarchs, and this ship was captained by a female Klingon who said she trained as a spy and that’s how she speaks English so well. L’Rell also told Voq he’d have to give up “everything” to win the war, and having to look and act human is that, especially for a Klingon who rages against assimilation and who comes from a time when “Remain Klingon” is the slogan of the day. (Also, “The Trouble With Tribbles” featured a Klingon spy made to look human—it’s not a new trick of the Klingon Empire’s.) It’s too ironic for writers to not be setting it up. And so the problem is that telling your audience this much that they figure out the twist early means, for weeks, we’re going to be screaming bloody murder at Lorca.