The reason is what good would it do? Yeah I want to see what he can do. But He's facing jubito. Ninjutsu attacks just get absorbed. If he were to even use suiton from a real water source or to gather water from thin air it wouldn't do much damage... Jubito was able to tunnel through the earth with just his torso easily. I don't think any suiton based techniques are useful here. I want to see it don't get me wrong but it's useless in this situation.