Boston Celtics shooting guardย Jaylen Brown is averaging career highs in several categories this season: 20.6 points, 6.3 rebounds, 2.1 assists, 48.8 % field goal percentage, 38.9 from three, and 73.1 from the free-throw line, according toย Basketballย Reference. Brown has improved every season since entering the league in 2016. In the NBA bubble, he is turning into…