In the wiki discussion, the admin mentioned that in the game data, chapter 6 act 2 is originally to raise Splatter dragon to lvl 15. Then on chapter 9 act 3 it says feed Splatter 10 times so it wouldn't have been possible even if the intention of the act is to go beyond level 10. I take it as the information posted regarding chapters 6 and 9 is not yet confirmed but hopefully it will be soon.