There was no sneak attack. Shanks jumped in front of Kid and Kid even said « red hair » before Shanks used Kamusari. Did Kaido sneak attack Luffy in part 1 because he failed to react to Thunder Bagua ?
It’s amazing to see your coping skills live in action. He said nothing about holding back. You said Roger and shanks aren’t cutting it’s more of a shockwave . He showed proof that swinging a sword without cutting is a master swordsman abilities and somehow you turn it into Roger and shanks aren’t holding back so I don’t believe that’s what they are doing .