Actually, I recall some old arguments I've had, so I'm about to do something controversial here.
I don't think we should scale Bomb to the Garou that fought Bang, or Bomb should get an
at most since he wasn't one-shot. Garou
significantly bloodied many different parts of Bomb's face, practically immobilised him, and
broke his leg with a normal punch (not some technique that bypasses durability).
'But Garou needs adversity to evolve' is a common (and false) argument that I've gotten in response to this; he simply
needs to be pushed to become stronger at random points in fights. Garou was able to
adapt to Psykos'
telekinesis when simply
held in place, get
faster in the midst of running away from Orochi, and
become faster and
stronger while performing hits rather than getting hit.
Even while overwhelming PS, this same Garou was accelerating, and grew to the point of
one-shotting him in the space of one attack.
Clearly, the Garou that fought Bomb is evolved and is << the Garou that stomped Bomb, who's in turn < the AB Garou who fought PS and AB Bang.