And if you lots of people modify a small program, and do not collect copyright assignments, then you will have a long list of copyright holders. Nothing different from dedications.
Says you who permanently keeps pointing out subtle differences in others' comparisons. Do you really need to be explained the difference between dedications and a list of copyright holders?
Again, I suggest you read what was written. I did not claim that they are exactly the same, just that they are not different enough to warrant differentiation.