Was it said in the last chapter that Gorrilla was the strongest of the Raikage?
Even if not, I'm going with Gorrilla, the only thing that could scar him was a Bijuu (which I'm not to sure how that is possible, if that was his natural body, anything should be able to wound him. It doesn't have to kill him but it should wound/scar him if it's a regular human body [like a stab or cut]...although he's a Gorrilla, and he could have something to do with genetics so Idk)