I'm a little confused on the use of timecodes audio that is recorded to a recording unit separate from the camera time code. Essentially I'm expecting these to not match up for various reasons and I want to understand the advantages of using timecode. No real experience using it.
Time code is a set of matching numbers on the camera (if it takes TC in) and the same numbers on the recorder. Usually in the professional world, the recorder generates the TC and it's sent to a TC slate that the camera looks at when it rolls. The TC is on the recorder as a seperate item in the file.
In post the tc number at the begining of the shot is matched to the same number on the audio track and locked together so that shot is in lip sync. That process is repeated for each & every shot in the project. OTOH if your audio is going direct to the camera and that's the only audio being recorded then TC is not required.