ImagineImagine a 5 layer cake. You place your knife edge on top and cut down at say 60 degrees. You now essentially have two cakes with a 60 degree face on both cakes. You then lift one cake up but with the faces still in contact with each other. You end up with a cake with more than five layers. The layer that was one continuous chocolate layer is now two stacked chocolate layers in areas close to the cut. Do that with rock layers and you can create multiple Santonian layers.
The slope of a listric fault gets less steep with depth. It's shape is not straight. It's a curve that goes from steep to almost flat with depth. That means that in the lower sections the two split layers may still be in contact for a given relative movement. In the upper sections for the same movement a split layer may be completely separated and stacked. Is that what Kawa's geology looks like? Is there a fault there? Because, if yes, then if the fault might be a migration pathway feeding multiple layers of stacked reservoirs at the same time. I sure as heck hope so!