He made it quite clear that no one who hatched from an egg knows enough about this planet to be of any use to his operation.

[ which is the only operation that really leaves the comfort of the leviathan's wings. that might be something that could help them figure out a way back to ravka, even — the chance to really look around at what's on the planet. what if there's another leviathan, still alive? ]

I'd hoped to help with mapping.