A look at skill efficiency, a measure of a particular ability in reference to a benchmark.

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The problem is that it doesn't hold for any of the past patches and it won't hold for any future patches. For example, zed was one of the strongest champions towards the end of last season due to how strong his map pressure was. Since then, he received a nerf to his attack speed and the return time on his ult. Both of the changes hit his map pressure hard (one to his split push and the other to his team fight) but neither hit his skill efficiency as hard proportionally.

If you read the entirity of the post I mention subjectivity is a big part of it. Outplay potential is subjectively taken into account. The reason I chose Kassadin's Q for instance as the benchmark was that it was targeted, had good cc, had incredibly good scaling and damage and functionally had a low mana cost. In other words. It was an incredibly good ability and abilities that are more efficient than an ability removed from the game for being strong would be an excellent indicator of probable power in game.

Tahm kench is another incredibly strong outlier I found. His base stats when accounted for at lvl 6 make him EXTREMELY efficient and I sense a must ban coming after the next round of nerfs to other champions.

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ehm..you do realize there's over 700 pokemon now, right?

I am referring to league champions. I am not literally referring to pokemon. Skill efficiency for all 6 most frequently banned champions is off the charts.