I have seen a lot of comments mainly expecting Somin because she was leader for her time in April, to take responsibility for the actions of everyone in her group even if it does turn out she was not directly attacking her. Which is a little ick as she does not control her members 1000%, now I do agree if she saw something and did not say anything, or was directly one of the ones who was the start of it, that is a huge problem.
So far though the kpop census especially on Reddit and social media is that she may not have done the bullying herself but it was "her job" to stop it all, and if she did not successfully do so then it is her fault everyone else is falling apart now. Which I do not know if I completely agree with, yes as a leader she can disapprove of their behavior and ask them to stop but she does not get the final say so in what happens as repercussions etc. DSP does.
Why do you think the company would remove one member who is the leader from an already debuted group just to debut her in another? Such a thing points often to them being a problem in the group. It is not always the case but removing the leader and placing them in another group is almost unheard of. There were also rumours a few years ago before the April scandal (I haven't kept up with Somin to be fair) that she is not getting along well with the other girl in Kard now but as I said I don't keep up with them and not getting along does not mean she is or was bullying the other girl.
There still could be a chance she was removed because her image didn't fit with April but considering all the things happening in April I doubt she didn't knew about the bullying. She can't control everyone in the group but I doubt DSP would, after knowing the group has some problems, remove a person who (if she did nothing bad) is probably the only one being half-way nice to Hyunjoo or at least keeping things civil in the group just to debut her in another group, when they can find another trainee to debut instead. This would be DSP asking for more conflicts in the group, if Somin was a more neutral or mature force and she got removed.
Here was an anonymous post being discussed here (but it is an anonymous account, which you can choose to ignore or not, I just link it here so you can see why people critized Somin): She's (Somin) the only one trying to get out of the April scandal