u put my thoughts into words. seems like the author was so lazy that they reused the exact same plot device of re-introducing a girl character, having Uruma tied up, killing them cruelly, then Uruma kills them. an actual copy and paste.
Not to mention that thanks to this pattern being apparent, there is no reason to care about what happens to anyone in this manga anymore. the author kills them off in a cheap way, by definition, fridging female characters so that Uruma can go thru some "badass" development, rinse and repeat.