flybody simulates no neurons and uses no connectome, so it cannot clear L1 — and L0 does not describe it either, because there is no connectome being used as wiring. It is the platform other projects attach a brain to. It sits unrated with that explanation, but the honest fix might be a separate mark for platforms rather than a gap in the scale.
Wanted: A decision: widen the scale, add a platform mark, or leave these unrated on purpose.