There's no way to spin these numbers in the OP. 10-12% of all WD sales were on PC. That's rough and there's no way around it. This is why we get late ports and optimization issues because it's 10% of the market for most of these big AAA games.
You are the one who's spinning the numbers using the gang-up mentally of 4 skus against 1.
Let's say PC sold 10% of total, that leaves the rest 4 platforms with 22.5% each. I'm not seeing what's outrageous with a 12% difference between your PC sku and the next best selling sku, in an industry where multiplatform games are designed and heavily marketed to capture the console audience. With all the noise you and others make about consoles vs pc and how inconceivable it is for people to play and buy games on pc, you'd expect a gulf between the pc sku and the next console sku. There isn't one.
And now, we all know the 4 console platforms weren't evenly split so that means the different between the PC sku and the next console sku is even smaller and probably a single-digit %.
And then you factor in PC players past experience with Ubisoft open-world games; the higher-than-normal system requirements and questioning what kind of a beast system you'd need to play it properly; the technical\performance mess at launch (that still exists i think); bad word of mouth etc.
And then factor revenue from each copy.
And we saw it with Far Cry 3 where the difference between the PC sku and the next console sku was less than 750k copies.
Since your mind was made up regardless of data, you'll do your best to manufacture one - which means always taking at least 2 platforms to compare to a single one.