What if when your genetic quality is low (like non-nesting spawns) you have better chance to hatch with a mutation/deformity.
Itll give a lot more challenge if it affects the growth. Like if a shadow scale was hatched with a missing tail fin, itd render them flightless and more vulnerable to things like acid spitters!
Itll be exclusively low quality nesting and the menu spawns won't be affected. (Or will they!?)
I think this would add a nice touch of realism to the game, and could add a lot more character to player's dragons!