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Yes, I understand this and it's how I've set it up. It's aligned with the 6th cog.
There was someone on weightweenies who'd produced a chart showing the alignments here
What I said, apparently the cassette spacing is not exactly the same, so the indexing is a bit off, just slightly. That's why you get better results centering it in the middle of the cassette, it drifts away a fraction of a mm each shift. That's what read on the internet, could be wrong.