One night, Yi Jianlian plays well and Josh Boone plays poorly. The next it's the reverse, but in the past several days, the Nets have had to deal with a sustained lack of progress from Brook Lopez. Lopez has fumbled the ball away and missed shots underneath. The promise of preseason has not been met. No one thinks he is a bust or is giving up on him. It's the opposite, but it's also frustrating for everyone.