Regarding the Ghostraven = Riley theory and the risk of MC/Ev finding out accidentally, do we know what Ghostraven's power is? We're aware of the powers of all the other members of the Sisterhood whether we're likely to fuck them or not, we've been told that she has enhanced agility, dexterity and strengh but that feels more like a byproduct because it's nowhere near Lady Steel's level of strength from what Ruth tells us, she says she's never met anyone with close to her super strength, and she's not exactly lacking in the agility or dexterity departments, so it could be that Ghostraven's enhanced skills are more like Lady Steel's fast healing than her actual power. If her power is that she's immune to other metaviruses so they can't be used on her then it would explain why Riley has no issue being touched by MC, the extreme agility and dexterity could just be a byproduct to allow her to avoid weapons wielded by enemies for example when just being immune to their power wouldn't guarantee survival, and enhanced strength would help her deal with giants for example even if they can't hurt her she'd need to be able to hurt them. It could also explain MC scrying his mom instead of someone he touched, if it was meant to be Riley and her power prevented it happening then it could be a strange side-effect that it pushes the scryer into the relative instead. It would be a way at the end of the story for Ev to be able to spend some nights as her mom if it gets revealed that that's the case.
I'm also wondering if Clara Dawson may enter the game at some point, or maybe she already has, possibly she's Scarlet Shadow given how she has Sofia at her beck and call, if she's still as manipulative as she once previously then that would explain having a pyro have so much faith in her.