The point is that you would be able to siege 2 islands, 4 bases , a natural and a min-only
So you can see that you're pretty damn screwed if a tank can be dropped. =P
ADDITION:
btw, incase you didnt notice, I'm making a MELEE map
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Sorry to be off topic for terrain but your saying that once 2 siege tanks are dropped at the 2 locations the other oppenent is dead already? How about toss and zerg? That seems imbalanced.