There is no confusion as to the pecking order within the Boston Celtics hierarchy on the floor. Kyrie Irving and Al Horford are at the front of the line. The Celtics know this, as do every team they face. But for Jaylen Brown and Jayson Tatum, that knowledge has been invaluable to their play which has been far greater and more consistent than anyone anticipated. And that play was one of the main reasons why the Celtics had no problem in defeating the New York Knicks, 110-89, on Tuesday night. Brown, who celebrated his 21st birthday with a Celtics victory on Tuesday, led all scorers with 23 points. And Tatum, whose play is nothing like what you would expect from a 19-year-old, was right behind Brown with 22 points. They became the first Celtics tandem ever to each score at least 20 points in the same game, and be 21 years old or younger at that time. “We’re going to keep getting better and comfortable with each other as time goes on,” Tatum said. Brown said his strong game against the Knicks was fueled in large part by the attention Horford and Irving were drawing. “I’ve got to make plays when they’re taking up a lot of that attention,” Brown said. “So just come out, be aggressive.” And he was quick to add that Tatum’s on board with that approach as well.