The main thing about Brock that shows you he actually cares about wrestling is his selling.
Someone who doesnt care wouldnt be selling like he does and make his opponent look good everytime he can.
For example at SS 18 against Bryan, Daniel worked one of his leg during the match, it played a big factor in the finish, first his knee gave up on him while he was gonna F5ed Bryan and DB applied the lebell lock him, finally he was able to lift Bryan for the F5 but he did it on one leg because he was hurt, that won him the mach but he continued to sold the pain after he won. He wasnt obliged to do that.