The video show how poor our half-court set up on defense are, we are playing individual-defense on a non moving team in the video, we are defending to close to men without the ball, plus having 3 players (KP, Sasha, Afflalo) not keepin their eyes on the man with the ball.
When Calderon seen how Cousins kept backing up our rookie KP Zingis, Calderon was suppose to push KP into Cousin to stay in front of Rondo.
1- Calderon letting Rondo get pass him so easy
2- Melo being the help-defense had enough time n space to challenge Rondo for a block
3- The above to veteran-players are who the rest of the team look for leadership-decisions on the court.