Thanks, that is exactly what I needed to know. I imagine that Brickable (or any other source) does not have the quantity of units or DKK amount sold for each set. If there is such information then, please, let me know.
You guys should really add a security check for subsets and alternative MOCS inventory is the full or a subset of the original sets inventory or the check will fails and the author needs to fix their inventory or submit it as a normal MOC.
I'm not on my pc so I can only take a quick look my phone. It could be that the sub sets have errors, like other mold versions of parts. I would need my pc with my test account to go deeper into it. I'll probably can do it tomorrow morning.
I think it's has something to do with printing pattern so the machine that put the arms in do it right. so you won't end up with minifigs with pattern on the back or arms the wrong way depending on how you see it. Machines are dumb they need black patterns like that to identify heading. it much easier then learning the machine all different prints.
Well that my theory...I have no way to confirm it but it makes sense to me.