Compare that infection shot with the one who Law used against Doflamingo, there are levels between:
Law one against Kaido was far stronger, had a bigger shockwave/air power behind the attack.
It shows how massive stronger Law also became during Dressrosa to Wano.
Overall states became insane, like physical, durability(haki?)and endurance. Taking Yonkou attacks with is insane.
Both Luffy and Law are >>>their Dressrosa versions and that without awakening...
Can't wait for awakening colored versions which are coming out soon.