Nargott
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Why is the first tier free? Necropolis starts with a guild of mages, not with a tier 1 building.
The 7th tier for the undead is not really a 7th tier; they essentially play without one.
It's one thing to get +2 angels from building an angel dwelling now and +2 angels every week, and another to get +1 bone dragon, which is only half as strong.
If you want to increase the dragon production, spend time building farms (+1 building). But even under these conditions, you'll still be behind by 1-2 units (3-6 thousand) due to the initial influx and upgrade.
Boosting production with a farm and a castle is not the same, as the castle also speeds up the upgrade and is generally a more powerful building (it affects other tiers as well).