On Gelel Stone:
the fact that it can apparently also take out a continent or something means its on par with the Kyuubi in terms of ridiculous strength. thing is, if its a chunk of Yang Release, that raises the question if there are stones with other releases, like is there at least a Yin Stone that causes Tsukuyomi like effects? are there fire, water, air and lightning and.....earth stones that can do similar stuff?

and they're mined from the earth.....oh god, are Gelel stones Naruto's version of Materia? we're one ridiculously powerful mega-corp away from recreating FF7, then all we need to do is take Kaguya's DNA from her conveniently well-preserved corpse and make ninja Sephiroth.

On Bargain Bin Ice Jutsu:
well if water ninjas can use pre-existing ice, plus the fact that Naruto's home life shows that modern refrigeration exists, that means that what Water users can do expands a little if they know how to exploit that: make a freezer to produce ice, then put that ice in storage scrolls, then you can shape the ice using water release for various things. I could see a lot of Land-based water users pulling that trick.

also: Poisons and Drugs in the Naruto world. thats one of the things Naruto doesn't focus on because of it being shonen, they were only important in one fight I can remember: Jiraiya being drugged by Tsunade with the fight with Orochimaru to make sure all three Sannin had some impaiment holding them back. I'm thinking that a poison affects everyone equally but its rating is on its obscurity and deadliness, lower rating its more common and less deadly meaning medic nin know how to cure it easier, and the higher ratings are more obscure and deadly. though I guess it can also affect how detectable the poison is? the lowest rank poison of course, is the D-Rank: alcohol.