Wondering this myself as its the first time ive heard of this.
So if I understand this right say im fighting a Water Boss:
1. Any debuffs from my Thunder Kami will have the highest chance to hit since its element with elemental advantage vs Water.
2. Wind, Light and Dark Kami debuffs will have essentially a neutral chance to hit since they arent advantaged or disadvantaged vs the element type.
3. Fire Kami debuffs will have a lower chance to hit since its elementally disadvantaged vs the element type.
4. Water Kami debuffs will have a lowest chance to hit since its the same element as the Boss.
Is that how it works? And as Slashley said if im fighting a Water Boss and I use a Water team does that also mean its debuffs have the lowest chance to effect my Kami?