Unlike the hatchery,the Incubator is a Key for Defense.
Why Defend it?
- If your Compound is full, Monsters stay in the Incubator. So they are good backups for extra monsters in the Compound.
- A Finished yet (Unproduced due to full compound space) Balthazar along with A Couple of Zagnoids is a good tactic for extra defense (Only if you have a couple of Balthazars with King Wormzers)
- A Finished yet (Unproduced due to full compound space) Valgos (Around 5 since you can have 5 incubators) can be useful (As backup if anything dies) if your compound has Balthazars and at least 2 or 3 King Wormzers.