As much as I love the idea of hidden markings, I also do not have a surplus of GB to use to unlock up to a marking that is potentially horrendous on a lion. Maybe if you could just unlock that slot it wouldn't be so bad, no worse than RMA at that point, but having to use more? Very expensive. Or to find out it's just a mane marking on a lioness. Very sad.

Which brings me to my suggestion, for those that wish to, the ability to scry for what the marking is. Then it can either just tell you, leaving you to record it, or it can log it, depending on how complicated it would be to code.