Amazing how one goes from "The 6s plus seems to have better battery life than the 6s" to "it must be the CPU!". Maybe its the motherboard. Maybe its other components. Maybe its just because the 6s plus users tend to have their screens on a lower brightness for some reason. Heck, maybe it's because the 6s users keep their phones in their pockets, while the 6s plus users don't. Or that there's a programming issue with something in the benchmarking software that's caused a glitch on the 6s that causes the benchmark to use more CPU than it's supposed to?
And who does this test really represent? People who spend a lot of time on their phones playing Candy Crush?
I stopped trusting benchmarking apps/scores way back in the 90s/early 00s. I'd sooner trust anecdotal evidence from 'real' users of a device than "well, my app says its bad". These kinds of stories is what leads people to say things like "I've had my phone for a month and didn't realize it was so horrible in battery life until I read this article about it!"