I doubt it, and I don't like it either. Tyler is the "bad guy" in disguise or hiding or whatever. We don't need two of them. I think it's just fans hoping we didn't actually get a Starfleet captain who acts as Lorca does. He's supposed to be a guy who is deeply ****ed up by his experiences in the war with the Klingons. That's it. Maybe he's still hiding something, but it's not something huge like him being the Mirror Universe counterpart of the "real" Lorca. A Mirror Universe Terran would not have given a **** about the sentient plant planet, and he would not have been able to hide his extreme nature for long. Terrans aren't exactly subtle.