So, when did Miura started writing this as well?
It was always a dark story for sure, but this is going Berserk level of darkness at this point.
That said, I agree this is not the right time to rewind. Skellebro at the same time knows too little and too much: it is obvious that someone extremy skilled is using the worms to replace people in key places and it is quite likely that the imperial family is all wormy now. But that is pretty much all that he knows ... the who and why are not evident, so a reset now would be not that useful. The issue is that they now know that Skellebro knows ... so there will be a reset soon anyway
Now, why didn't they just replaced the Marquis? It would be far less suspicious than what they did ...Well, apparently Skellebro will need to eat his words and actually investigate all that wormy business in the capital. Before of after being killed ...