Who the heck will it be then?: Someone who might not be on our radar yet, or someone we've not been given permission to discuss here.
And why?: We don't know just yet, but maybe for the same reasons that it could have been DN.
Several people have said similar but haven't elaborated. Why can't you explain ?: I've seen a lot of good discussion on here from people who are either on the fence or else certain that it isn't DN. We've all pretty much already given our reasons. IMO, however, when the reasons why we think DN isn't BG are listed, it leads to an argument with others who do believe it's him telling us that we're wrong. Lack of concrete evidence/no charges yet/sketch and picture look too old to be DN/without COD it's hard to know if it would match DN's MO/no connections or ties to Delphi outside of speculation/gut feeling all seem to be popular ones, if you go by the threads. Some on here have said that they "know" it's DN because they have a gut feeling. For others, it might work the same way for the opposite.