Continuity mistake: Dawson and Atwater are tracking a suspect at a bus station locker. The suspect takes the bag from the locker and they take off after him. They pass the same bank of lockers twice.
Continuity mistake: Toward the end of the show Voight and Ruzek are in their car chasing the suspect who is running. Sgt. Voight gets out of the vehicle first and is chasing the suspect toward the stairs only a few yards away. When they get to the stairs Ruzek is in the lead.
Answer: Because he is a great cop and gets the job done better than anyone.