Uh… I’m thinking that once you’ve exported your reference file, it is then independent of whatever sequence stuff you may have going on. It has all the information from the sequence the way it was when you exported it, and it doesn’t reference the sequence – it references the original media, conforming it to the specifications of the sequence you output from. So you could change/delete/lose your original sequence and your reference file would still work just fine. I will admit, you’ve put a seed of doubt in my mind, but I’m pretty sure this is the way it works.
Nick