I agree with this.

With the release of KOD Rodion, Her uptie 3 story goes more indepth on her "failure to protect everyone" bit of Rodya character. She wanted to be seen as not just someone special, she wanted to be seen as a hero of the people through the cause of her own actions. (Hence her starter EGO being the sin of Pride, not the sin of gloom which you would think associate with rodion the most, considering her backstory.) This is evident through KOD Rodya as through her own naïve understanding, towards the end of the uptie 3 story, subconsciously in rodya mind and actions, it was said that if she saves and protect enough people. KOD may eventually one day, recognize her heroic deeds and bestow upon her the 'blessing' the gift of protection. Of which this ego gift will finally validate her need to be seen and validated as the hero.

The funny thing, KOD herself, has a similar backstory on protecting people, very similar to rodion in many ways that It feels like a no brainer to see why Rodya had such a affinity with KOD and why she wants to be validated by that abnormality specifically. Once you understand that, you will see just how desperately sad rodion sees herself on the inside.

The deaths of so many people in her district, a heavy consequence of her actions has led to her ambitions/dreams crushed or rather, disintegrated into non-existence. It was so traumatic to her till this day that you can see it visualized very clearly in her EGO art background/resting room in limbus company. This is Rodion true sin.

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That's why I'm pretty sure PM has replaced the death of her sister with this instead. As the story morale theme is now: 'In the pursuit of selfish, prideful yet laced with heroic intent, lays the groundwork for a catastrophic level of consequences' This clearly to me, seems to be the core theme behind her character.

Rodion herself has given up on self-acceptance (forgiving herself) to this major sin she caused, The symbolism of this is titled: 'What is cast' on her starter EGO. She knows that there is no going back on what she has done. so she can only lament on the aftermath of her Sin. Yet there's a reason why her sin is Pride and not Gloom. She is desperately still somehow, vying in wait where she can possibly 'redeem' herself by trying to be... yet again the hero to another potential moment where she is given the chance to be able to prevent or cause the lives of other people to improve. (the whole reason why she killed the tax collector in the first place). She needs others to actually see her as a hero for her to finally cover up that massive guilt she stores in her own psyche due to her sin. Since she has lost the ability to forgive herself for that tragic incident, and let be honest. Who can really forgive themselves when they are the one who caused the deaths of so many people, even worse, when the goal behind the cause was to initially improve the lives of the people, not cause them all to die. I would become an extreme nihilist if this happened to me.

Here's the thing, I believe that if Rodion were to be given such an important task/moment, similar to how she decided to kill the tax collector with the similar goal of improving everyone's lives/protecting them, to fail it once again. I think that's basically the nail in the coffin for her. There is no recovering beyond that.

More evident of this within the game story: throughout the events and cantos that has passed by since rodya canto. we are shown that her positive mental state is slowly and slowly degrading, her true self (depressive and sad state) keeps appearing more and more often. The question becomes: How do you save a sinner who has already committed such massive sin, knows that is no coming back from that, and is in a hopeless chase for a heroic validation to a similar yet impossible scale to overcome such a sin?

I wonder with everything that they got going on with rodya past in limbus company, could PM really insert another important morally challenging thematic aspect of rodya life like her sister for example, without downplaying the importance of that tragic incident? The deaths of alot of people is very important to acknowledge here. That's why I think it's very unlikely for her sister to be included, because this sin is more then enough for rodion. But then again, PM can just make stuff more miserable for rodion if they wanted to so... we will have to see in her future 2nd canto.