Of course, he could.You really think Bron wouldn't have played better if he could? We're only 6 months removed from him dropping 40 in a closeout game in the finals. Three years ago, he had like ten 40 point playoff games. He clearly lacked that second gear.
He quit on offensive possessions when he didn't get calls, instead of running back on defense, multiple times. You could tell he mentally gave up and was going through the motions at the back end of this series.