It's indeed confusing.
What is displayed in "Most Game Impact" listings is rather KDA difference (K+A-D), and not ratio.
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As for ratio, it shows wrong value in case you had zero deaths. For example for 4-0-13 KDA it displayes KDA ratio = 1. It's obvious that one cannot divide by zero, but why not:
- display "infinite" or
- maybe show "-" instead, or even
- ceil the number of deaths to 1?
It appears like the formula on the Game Impact page is incorrectly calculating it as K+(a/d).
Please make overall statistics kills/death = number. Without assists! Or 1 assist = ~0.33 kill. kills+assists*0.33/death.
Game impact is (k+a) / d - if you took part in the kill, it doesn't matter whether you got a last hit or an assist from it.
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Now with KDA being shown on the most played heroes, all these numbers differ from if you sort your heroes by "Most Game Impact".
For Huskar it displays a kda of 3.13 on the most played list, but the KDA shown for most game impact is 13.68. This is confusing, please clarify.