In the above case also, think about the consequences of having the developer move the graves. What records might be available to show the new locations of the existing graves in the developed cemetery? This important understand from the standpoint of doing genealogical research, that any particular record concerning an individual may have either never been created or may have been lost.
As I pointed out in the title to this post, how would you like to live on an abandoned cemetery site? By the way, you may be living on an abandoned cemetery site and not know it.