Just a question but why is rin's effect water??

He is pretty logical not the point of isagi but still even when he is in flow he still has a logical standpoint on his opponents weapons and the way to defeat them and he is 3x times stronger than normal isagi before nel league cause of his powerful kick and vision of the field.

So why give him water??? As it's also not used as frequently as isagi who every 2 secs in the match begins to crumble with his puzzle pieces.