If it in parenthesis it is from somewhere else. Birth and Death dates have been standardized to make a neat table format. Anything odd will be noted in the comment field. In those cases where a birth date is not listed, just the age at death, this age will be entered into the Birth column. I do list every single grave - even the ones without a name.
Every life is important.
On the surname indexes, anything goes. Spellings are more standardized to help your search. I do try to index the ladies by their maiden name as well as married name if I have that information. This information may or may not be accurate. Nick names and middle names can get complex.