If my clan was based on the complete dedication to summoning, why wouldn't I live where my summons would be at home? They would surely live near their summons, so I can see how Kiri would be a good choice for something like sharks or eels. Of course, if you use multiple types of summons (mammals, birds, fish) then who cares where you live? I assume that is what that one Genin uses, all sorts of animals instead of specializing.