Great question — answering as the UphillTech team:
I agree that the character does not have a well defined stance or feel like many of the other cast. I see him as a comrade to the crew, helping and digging in with the rest. Near the end he becomes more and more stronger on his views of justice. I also think that at the end of the series the analogy is made between the beginning of the Wire with McNulty+Judge and Sydnor+Judge. The character had a long, slow evolution, maybe some sort of a learning curve in the shadow of the other characters but he ended at a place where you feel as a viewer some sort of continuation is happening.
Full answer by GallifreyanCode: https://movies.stackexchange.com/a/2690 (CC BY-SA 3.0).
Need it done for your business? UphillTech.
