While it's a neat suggestion, I do have a few questions about it:

- Who will get the Master Thief map?
I assume the player who had the Dragonskin map will get it.
- Will they be similar to the Unhidden maps, in the sense that they're not unique, and can be stacked up?
- Like the Unhidden maps, will it be possible to sell these on the marketboard?
I think they shouldn't be. It'd create a scenario where the Dragonskin map owner would just keep the Master Thief map to sell for x gil, instead of actually doing the content.