Omori Au’s discussions

This is specifically about Omari Au’s in particular! I have a question. When I see a lot of these AU’s, I see people (obviously) switch Sunny and Mari’s roles within the story But I (and I don’t know if anyone feels the same way) don’t understand why people send Mari down the same grief path as Sunny. Sunny isolates himself for 4 years and is in denial over the fact that Mari died. I don’t think that Mari (Who is older and is much more Mature than Sunny) would follow down this same path. As People do grief differently! It’s also weird to see people get rid of key aspects of the main sixes personalities to fit the new narrative. What do you guys think?