The genius girl was probably what made the nobel prize guy kill himself in the first place since he killed himself before the mom's plan could come to fruition.
It would waste the villain and make him a non-threat before the MC even faced him.
Because who cares about the MC fighting a guy weaker than the guy he already defeated?
Thanks for translating to the end, I really liked it despite the weird pacing.
Also seeing everyone remind me there's so many of them we never even saw fight. I really like the plant girl's ending too.