The stretches people are making to claim basic good writing is "Eden Garden using Danganronpa tropes🤢" is baffling
First off, since when is "important person" dies first a trope? Think about how much screentime these characters get in Danganronpa chapter 1s.
Sayaka - Yes she was a twist, thats the point. Needs screentime to make her death impactful
Mukuro - Only important in Chapter 5
Leon - Hes kinda a nobody in Chapter 1
Twogami - He exists as a plot device
Teruteru - Literally just the horny creep
Nagito (twist) - Gets screentime to set up twist
Rantaro - Death sets up chapter 6. Meant to be mysterious and unexplained.
Kaede - Fake protag twist, player character.
I think most of us can agree that Sayaka, Nagito and Kaede are the most impactful, the rest are sort forgettable and underwhelming. Leon, Twogami and Teruteru barely get thought aboit after they die.
Would it really be a good idea for Eden's Garden to have an "offscreen" plot where a murder happens with minimal context. Think about the screentime stays the same until the murder. Imagine we find Wenona in the boiler room stabbed to death. Elosie stabbed her. When exposed Eloise goes "I miss my mommy and Wenona was mean so I killed her". Like, this would be pretty bad as neither have character development or screentime.
Wolfgang and Eva have screentime, so their deaths have impact. They aren't killed because they seem important. Even to consider Eva the "support", the girl is clearly not trustworthy, how would she be a support like Kyoko, Chiaki, Shuichi/Kaito?.
Imagine Wolfgang was killed. We dont know his blackmail. Diana just says "oh he was lying there then a bomb went off, I dunno". He'd be an awful victim. He got screentime so he would work as a victim.
Eva is a bit iffy, but they set up why she would snap and try to escape but showing how everyone distrusts and mostly hate her repeatably. We get to see why she kills. With Teruteru for example theres no set up. Its just "I miss my mom, oh and Nagito wanted to kill someone" at the end. Imagine Eva got two lines of dialogue and her talent, backstory and motive are all slapped at thr end of the trial.
Good writing decisions are not a trope people. Sure, they do play on people expecting there to be an obvious "main cast" at the start, but even then its pretty clear Kai and Diana were getting more set up than Eva and Wolfgang in this regard.