I had some exposure to document examination before I retired. It would take great skill to make such a close forgery free-hand. (Not that David Axelrod couldn’t find someone to do it). The signature differences could be explained by the difference in passing years. (But they’re still pretty close—a little TOO close—maybe a tracing?)
The difference in inks, however, could be readily disclosed through infra-red lighting. (And why Moore has asked for the original).
She copied it off of a divorce settlement paper she had from Moore.
That’s why “D.A.” is there.
They’re initials from an assistant.