I think the rank was that indentured were newly uplifted and served their patron race for a number of generations. When a race you uplifted became a patron race by uplifting another race you’re race became a senior patron race. Senior patron races had the most power and respect.

Humanity either not having a patron or having been abandon by it’s patron would have been made a indentured race to a patron. Except we had uplifted chimps and dolphins putting us into patron status as soon as we entered galactic society.

This line jumping made us disliked by most other races. We also tended to be more like partners with or uplifted races instead of treating them like inferiors. Which made a lot of other races nervous their indentured races might start wanting the same.