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Here's something I noticed recently.
Some creatures have a rather strange weekly growth rate. Some creatures have a low growth rate, while similar creatures (and those comparable in strength) have a high growth rate.
For example:
Enforcers - growth rate of 5, cost 280
Elven Scouts - growth rate of 10, cost 160.
These are roughly equivalent, with the Scouts even being slightly stronger.
Why is this the case?