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It will be stated in chapter 30-32
He wants Sunagakure to become his by becoming Kazekage
You could argue that it is a forest, not a jungle. For the record, you see the most terrifying poisons in Australia's desert so I thought it to be pretty logical for Sungakure to hold this lead. However, I guess in the naruto world, it also depends on the clans' specialization. Aburame is pretty strong, but it is small in comparison to the wild puppet brigade (not a clan, but you see my point)
No it does not exist
Most of it is AU, coming straight from my imagination haha
Lol
It is also for the sake of Drake that he is keeping his mouth shut i guess
He is famous =)
You can think of its features =)