Some bright spark once pointed out to me that most legible copy i.e. top copy should be left with ground station. During the post accident investigation it would be more easy to reference.
What if an illegible loadsheet had contributed to said accident?
You can dispatch without a CVR but it would not be wise to dispatch without the best copy of the loadsheet. It doesn't matter whether that is the original or the copy.
The only place I ever encounted a conflict on the matter was in EGKK with a very unpleasant female redcap who told be incorrectly that it was DOTT regulations that she should have the original. I said that's fine but go back and get me another.