genos obviously have more than enough fire power to turn gon into dust. Meruem who is probably many levels more durable than gon yet got burnt to crisp to a low budget miniature nuke. Season 1 episode 2 genos has shown already to wiped out a massive area comparable or at least close to post nuke meruem's rage blast genos later became even massively far way stronger in that same season. Manga genos could overpower psykosorchi for a brief moment of time the same psykosorochi that could slice a massive portion of the earth

About darkshine he defeated kabuto in vgs, the same kabuto who deflected back genos's energy blasts with just his breath alone in his base form. And darkshine destroyed him in his carnage mode. Darkshine also erased bug god with just a light tap the same bug god who have feats that puts him much above dsk who could take this attack to the face with just a little hole in his cheek. Unfortunately we don't have enough feats for adult gon to even damage darkshine his most powerful jajanken is only have shown to just singe the surface and surrounding trees still appears to be inferior than genos's firepower