I may have to go back and read that part of Episode 7 again, but couldn't Earth to Earth refer to that there were no illusions in the way they died?
Kanon getting stabbed with a stake and pulling it out is an illusion. Kyrie actually getting staked through the stomach is not. It is also this wound that she dies from, just not when we think it happened. It also solves the whole "there may be a person who died at the time of the red who wasn't dead when Nanjo was killed" thing. Eva, Jessica, and Battler could not kill Nanjo, and Nanjo was killed by another person.
No, there are no illusions about how Kyrie died. Earth to earth, she died because of stake wound to the stomach in the mansion. But there has to be one "Illusion to Illusion" or "Earth to Earth" that obscures a fact from the audience, and this one can easily do it. Kyrie isn't faking her wound. It is real. All the other illusions are faked corpses, not really closed rooms, or subtle explanations of what really transpired.
Rudolf really died from a stake wound.
Hideyoshi really died from a stake wound.
Kyrie really died from a stake wound.
- Kyrie: "The stomach isn't a very lethal spot." Welp.