It was good seeing Darko in there early yesterday, but his timid defensive skills were exposed because the game still seems to be to fast for him. With Al Jefferson's hustle and speed, Darko appeared to be a step slow in guarding him and yes he needs to be more agressive in either stepping up to grab a board, a loose ball, and putting those long arms is someone face. More PT in the first part of the game will increase his confidence as well as get him more involved in the past face of the experienced players.