The rock farm seems to operate a lot like an Amish farm or something out of the 1800s.
So what if Maud actually is “Inkie,” and we’ve never seen “Blinkie” again because she died of a childhood illness?
They show a photograph that has all four sisters in it. That’s the thing I don’t like about Maud though, that they simply added her in when Pinkie already Had two uncharacterized sisters they could have used for that same role, and then despite Maud showing up in some episodes since then, we still never see the other two show up.
I like the “inky is Octavia” theory best
I have heard that one and it does amuse me.
It’s even more ammusing if you like the theory that vinyl scratch is bluebloods daughter. Because then the most respected canterlot musician came from a rock farm and the awesomest club DJ came from canterlot.