You don't know what you are talking about. Impact is subjective. It is a part of "effective striking" but it is only half the story. The other half is volume of strikes. And impact isn't judged strike for strike, its judged on the round as a whole. Who's striking had the greater impact? When there is no clear edge, the tie breaker is the number of strikes.
So you are wrong on multiple accounts. The number of strikes does matter. The statistics measure both the quantity and the quality of strikes (aka sig strikes) and are far less subjective than "impact." The whole reason impact is part of the criteria is so that KD's and other hard shots get more weight in the scoring than your average sig strike. That said, even if you base it entirely on impact and ignore volume, that favors Volk in the Volk/Max fight.