Hey, no problem at all. Those are all great questions. Basically, if you took the file to a printer/designer, all they would have to do is open it in Illustrator and they could turn on/off the grunge layer as needed. I would also provide both grunge and non-grunge versions in multiple file formats, so that you yourself would have each variation of the design on-file. All conventional needs would be covered by each file type, which I can spell out in more detail later.
We are not allowed to provide two completely different designs via this site, but providing grunge/non-grunge versions of the winning design would be no problem at all. Also, providing it on white vs black backgrounds is not an issue either (since it is technically the same logo). So, all of those could definitely be prepped for you.
I will get that revision of #64 posted right now.
Let me know if you have any other questions, or if you need anything else clarified. I appreciate how involved you have been throughout the process—definitely one of the more attentive contest holders!