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I'm sorry to hear about your situation. Assuming that the warrant was still "active" and there was no indication that the warrant was obtained by false information given by a police officer, then it would not be a "wrongful" or "illegal" arrest. Illegal / wrongful arrests depend upon the knowledge / intent of the officer arresting or that supplied the information for the warrant. But if it was a valid warrant that was still open, even the fact that it was so late, and even the fact that the driver was not charged / let go, etc... means that the arrest was not illegal. It was only illegal if the warrant was closed, or obtained with false information knowingly/intentionally by the officer submitting the affidavit 9 years ago.
I know this is probably not what you wanted to hear, but it is the law. I hope that clears things up anyway. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable.
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Thank you, ***** ***** luck to you!