That sounds like it may have been a mistake. I think they were all supposed to be signed, and some were personalized by request. They all should have been stamped and numbered as well. Does yours have a stamp and number? It would be on the same page.
The human group you’re missing is the Planetary Union.
Do you have the hardback or ebook for THE ROOKIE? There is a Galactic Timeline contained therein that should give you an idea of who was fighting with whom during the time period you’re investigating. If you do not have those, you can check the siglerpedia article with the same information.
BigJohn replied to the topic the finger in the forum THE MVP (SPOILERS! DO NOT LOOK IF YOU HAVE NOT READ!)
It was previously established that severed limbs aren’t always reattached. Think of Manny Sayed’s foot, or Paul Pierson’s leg, or even Miriam Connor’s arm.
Also, let me ask you this: Have you finished reading THE CHAMPION?