one more:
why don't you just
-summon Katsuya + Gamabunta
-Katsuya uses her Acid, Gamabunta his Water Bullet, --> Acid Water Bullet
then I use Rasengan on the the entire sphere, using chouji's jutsu so enlarge my hand.... then I would have a Rasengan with implemented acid-water-bullet jutsu...
then with my free hand I simply use Shikamaru's Kage Shibari Jutsu and run against the enemy with my Acid-Rasengan-Water-Stuff and hit him high?
Guys... you cannot throw together stuff only for MORE MORE power... you don't really think about it do you?
Chidori -> instable, randomly
Rasengan -> fully controlled, precise
and what comes out? Right, -> crap.