I finally give in to read the history from wikipedia just to find out what's gonna happen after ch 17 lol, so basically this will happen sooner or later:
https://en.m.wikipedia.org/wiki/Honn%C5%8D-ji_Incident
https://en.m.wikipedia.org/wiki/Mori_Ranmaru
The mangaka will probably make their own plot twist so that's why I'm staying here!
This mangaka could milk this trope as much as she wants and I will never complain about it
She's a good writer so it doesn't really matter if she likes recycling