[quote=Rilla]
I'd say maybe 2 or 3 
Low-Tier = 1 Mid-Tier 
3 Mid-Tier = 1 High Tier
9 LOw-Tier = 1 High Tier
[/quote]

So, 3 in between tier with +- 1 for the minor difference?

3 Low-tier = 1 Mid-tier
4 Low-tier = 1 high-Mid-tier
2 Low-tier = 1 low-Mid-tier

EDIT:
[quote=ImportantNobody]
I thought it would be much more. How could 9 generic humans fight off someone with the defense of a star destroyer?
[/quote]
or make it quadratic difference?