User blog comment:RA2/Series 7 Rankdown/@comment-2118191-20191107154049/@comment-9751413-20191107171159

I dunno about that. There are enough robots with different ratings to affect this. Thor Series 8 was one of the best robots there, but it got progressively worse, while Nuts was the complete opposite. The side competitions of S9 and S10 will also help bolster those series'.