Did the other MS get the formula change

I'll sum the rumors up and let's expect answers:

1. There was a new EXP-splitting formula which was invented in the direction of discouraging leeching
   
2. It was applied only in kMST, not kMS itself
   
3. It came in the Aran patch and only applied to Arans
   
4. It got removed after a certain period due to complexity and inefficiency
   

1. Yes.
2. The first anti-leech exp formula was indeed only applied in Tespia, but another formula was made and came to the official client along with Aran.
3. Lol no.
4. In Tespia yes, but the only things that really matters is what makes it to the official client. Once there, chances of change are low.