Bonuses for that last post:

1. It occurred to me only as I was writing it that since the frogs on the Land of Heat and Clockwork are ruby contraband, “frogs as genetic material” and “grist as genetic material” aren’t necessarily exclusive from each other

2. The Battlefield evolves as it is exposed to kernels; so in addition to serving a similar function to the mother grub, the Battlefield would have literally taken on mother grub traits when Kanaya prototyped her mother grub lusus