Do end game ranks need some fine tuning?

Look at this match of Kindred that I played. The scores that are worth noting are: Kindred(me) - A Graves - S- Sona - A

It is worth noting that Graves did do more damage than me and had more cs, however some not recorded stats that are worth mentioning: I ended the game with 12 stacks of Kindred's passive, and I got Sated at ~18:00. Although recorded and viewable you might not notice - I got 2 turrets 2 dragons and 1 baron.

Thoughts? Were these ranks the correct ranks to give?

*Note I am not complaining about my rank because I am salty I didn't get an S, I honestly don't care. I may care in the future though when I have longer games that end with a similar result.