Not sure if it's been brought up in here before, but let me put it out there before it happens on-panel. Most of us have come to the conclusion that Blast didn't use his entire arsenal against Garou. Given how long he's had his abilities and the fact that he canonically "manipulates the reality of the cosmos" he should have access to insane abilities, some of which should be too dangerous to use on earth like nuclear fusion.
Long story short: Blast can conjure swarms of mini homing black holes which he can use to create an aurora of his own much like Homeless, only his ability is too powerful to safely use on earth.
I'm expecting potentially insane dark aurora feats in a future Blast fight where he has to go all out because Tatsumaki imagines him with this ability in chapter 141. I forget where Homeless's orbs were compared to miniature suns but I'm betting Blast has the opposite and far more powerful ability.