First of all - those crossfights always look weird. Like either the expected winner is underestimating the fight, or is not taking it too seriously (or who knows - maybe they agreed on a show). It's too harsh to just criticize Usyk. His opponent today wasn't a random guy. It's one of the best fighters in the world.
Anybody can see the final bell in round 12. All you have to do is run for a round. How do you think Jake Paul made it 6 rounds with AJ? Not because he stood infront of him and boxed.
Why do you think he didn't make it to the 7th? Because he was dead tired and badly dazed. RIc wa heading into the 12th, tired and badly dazed. Get the picture?