The scorpion core was NOT an A9 class chip. It was an older design more comparable to the A8 and was released long before the first A9 designs hit the market. (Some of the first scorpion devices were released in 2008, almost five years ago) Qualcomm's answer to the A9 was the original Krait, which destroyed the A9 in every conceivable category.
Similarly, the krait design was released before any A15 designs were on the market, so you cannot compare them. The correct comparison for the A15 is the newer krait core in the 600 and 800, both of which match or exceed the A15. (In the case of the 800, they eat other off the shelf ARM designs alive)
Also, the big elephant in the room you've missed is that Apple's custom chips prove your assertion wrong; in every category, apple's chips decimate any off the shelf ARM design. In most cases, they do that with two fewer cores and a much lower clock speed.
The reason why is simple: when a chip design is custom, every single specification is built to serve a specific purpose, and it is much easier to get higher performance out of those chips when you control the design from top to bottom.
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