it was 71-57 when duren went out (and he was doing basically nothing). in the time duren was out reed had 6 pts, 6 rebs, and 3 blocks. almost more than duren had in 3x the minutes.
it was 72-69 when he came back in.
duren is doing basically nothing and having either stew or reed in the game for him gives the pistons an advantage.