Yeah if you want to match it, then yes I am trying to tell you that. If the customer doesn't care, nuke it, just make sure you have him sign something saying it is ok.
There really is no need to deglaze the whole thing. Every jacket, case, and car seat I have ever repaired, I only concerned myself with about 2 inches around the trouble area. With proper prep, and finishing, there is no need do remove the whole finish. It also helps reduce the amount of other things that can possibly go wrong.
If you are going to nuke the case, then you will have to deglaze all of it.