Think of the online editor like you'd think of a mastering engineer.
Sort of...
Kind of...
He's the guy that takes the oflline editor's output and makes it look pretty...but he does this in a more "technical" manner as opposed to a "creative" manor.
IOW...he's the turd polisher.
Damn...now I've managed to piss off both online and offline editors...
Cheers,
Tim