Very early in story, Kakashi fought against Kakuzu's combined fire and wind release technique with just Water Release it was overpower, only a combination
of water and wind could counter it. Also, two techniques of the
same nature would cancel each other out if the same amount of chakra was put
into them. Now let assume 2 opponents have equal chakra in the justsu.
Ninja A having Earth + Fire,
Ninja B having Lightning + Water. Applying the above rule Ninja B should win right? But Ninja A also having 2 nature have lava as kekkei genkai, but Ninja B (eg darui) might have have Storm or some powerful lightning jutsu as kekkei genkai. So now it's it completely differnent jutsu, It's Lava release VS Storm release. By this theory Storm release should be superior. Accordingly,
So to counter wood release=Earth+Water. Opponent ninja must have Lightning+Earth? Could Lightning+Earth=Magnetism
of water and wind could counter it. Also, two techniques of the
same nature would cancel each other out if the same amount of chakra was put
into them. Now let assume 2 opponents have equal chakra in the justsu.
Ninja A having Earth + Fire,
Ninja B having Lightning + Water. Applying the above rule Ninja B should win right? But Ninja A also having 2 nature have lava as kekkei genkai, but Ninja B (eg darui) might have have Storm or some powerful lightning jutsu as kekkei genkai. So now it's it completely differnent jutsu, It's Lava release VS Storm release. By this theory Storm release should be superior. Accordingly,
So to counter wood release=Earth+Water. Opponent ninja must have Lightning+Earth? Could Lightning+Earth=Magnetism