Me too. Until further info becomes available that is my go-to theory.
I'm sorry, My responses are limited. You must ask the right questions.
...And so as long as men die, Liberty will never perish.
Simon is dead. I go for the merlin and ancient mai. That is a better choice because they are both still living.
Isn't Warden Yoshimo(?) a female, the chick Harry mails for info on her family lineage being related to royalty when he's researching the swords?
Dead is a very flexible term in the Dresdenverse.
The problem with this is that they both spent DB in Edinburgh hiding from the Rampires with the rest of the Senior Council. They didn't really have the opportunity to go cosplaying in Chicago.
Doppelganger. The real merlin and ancient mai were in Chicago.
I remember someone, maybe Griffyn, did the math for potential height range to hold a knife to Harry's throat.